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Thursday, October 23, 2014

The adaptation in the insectivorous plants


Dieonaea
The dieonaea is from the insectivorous plants .

It is very important to know that the insectivorous plants are called also the insect-eating plants , the predacious plants and the carnivorous plants .

 

Monday, October 20, 2014

The adaptation and the motion in the mammals


It is very important to know that the mammals move with the different ways as they live in varied environments , So the mammals limbs were modified in many shapes and forms to suit the required ways of movement such as walking , flying , swimming , climbing and diving .

Wednesday, October 15, 2014

The general properties of the alkaline earth metals in the modern periodic table


 
Alkaline earth metals
Alkaline earth metals in the modern periodic table .

It is very important to know that the alkaline earth metals are located on the left side of the periodic table , They are the second group of s-block after group ( 1 A ) .

 

Sunday, October 12, 2014

The classification of the arthropods according to the number of the legs


The arthropods

It is very important to know that the arthropods are the invertebrate animals that are characterized by the presence of the jointed legs .

 

Tuesday, October 7, 2014

The classification of the animals according to the nature of the body supporting

It is very important to know that the animals are classified according to the nature of the body supporting to the soft bodies and the supported bodies .

 

Saturday, October 4, 2014

The classification of the plants according to the external shape and their way of reproduction

There are enormous diversity in the living organisms , So , They must be classified into groups to facilitate their studying . We can classify the plants according to the external shape and the way of the reproduction .

 

Tuesday, September 30, 2014

The effect of the extinction on the ecological equilibrium


It is very important to know that the Ecosystem is everything that related to the living and non-living things existing somewhere , for example the forest , the desert and the sea . In any ecosystem .

Monday, September 1, 2014

The types of the sound waves

 
The sound range

You should know that there are two types of the sound waves which are the audible sounds and the non - audible sounds .

 

The audible sounds such as the sonic waves , And the non - audible sounds such as the ultrasonic waves and the infrasonic waves .

 

Wednesday, August 27, 2014

How can the human ear differentiate between the sounds ?


 
The sound wave
The sound waves

It is very important to know that the human ear differentiate between the sounds that reach it through the different factors which are the sound pitch , the sound intensity and the sound quality .

 

Friday, August 22, 2014

The nature and the properties of the sound waves


Sound wave
The sound wave

 

The sound

 

You should know that the sound is an external factor that affects the ear causing the sense of hearing . And it produced due to the vibration of the bodies , and it stops when the vibrating bodies stop their vibration .

 

Thursday, August 14, 2014

The importance of the fossils and the suitable conditions for the fossils formation


 
The fossils

The suitable conditions for the fossils formation

 

It is very important to know that the organism body must be buried immediately after death in a medium that preserves it from the decomposition . The organism must have hard skeleton .

 

Monday, August 11, 2014

The types of the fossils and the ways of formation



 
The fossils

The Fossils

 

It is very important to know that the fossils are the traces and the remains of the living organisms which are preserved in the sedimentary rocks .

 

Saturday, August 9, 2014

The water pollutants and the protection of the water from the pollution


 
The water pollution
 

The water pollution 

 

It is very important to know that the water pollution is the addition of any substance to the water which causes continuous gradual change in the water properties and affects the health and the life of the living creatures .

 

Friday, August 1, 2014

The physical and the chemical properties of the water


 
The water

The physical properties of the water 

 

It is very important to know that the water has a higher melting point , boiling point , and heat of vaporization than most common liquid . This fact indicates that there are strong forces of attraction between the adjacent water molecules .  

 

Tuesday, July 29, 2014

The importance of the water and its structure


The water

The importance of the water

 

You know that there are no living organisms can live without the water as it is the medium through which all the vital processes take place .

 

You should know that the water in the oceans and the rivers is an important means for the transportation between the cities and the countries .

 

Sunday, July 27, 2014

The negative effects of the global warming phenomenon and how to overcome the global warming




Global warming phenomenon

The global warming phenomenon

 

You should know that the global warming is caused by the greenhouse effect , And It is the continuous increase in the average temperature of the Earth's near - surface air .

 

Thursday, July 24, 2014

The erosion of the ozone layer and the protection from the ozone layer pollutants



The ozone layer

The erosion of the ozone layer

 

The ozone hole is a thinning or losing parts of the ozone layer above the south pole .

You should know that the scientists have noticed that there was the erosion of the ozone layer above the South Pole , Since 1978 , And it is known as the ozone hole .

Monday, July 21, 2014

The importance of the ozone layer and its structure



 

You should know that the ozone layer is located at the height from 20 to 40 km above the sea level , And it is located in the lower part of the stratosphere layer , As it is the first layer of the atmospheric envelope which contains a suitable amount of oxygen gas , and it also faces the ultraviolet radiations that emitted from the Sun .

 

Friday, July 18, 2014

The atmospheric pressure maps and the instruments of measuring the atmospheric pressure


The air pressure

The atmospheric envelope of the Earth

 

You should know that the Earth is surrounded by a gaseous envelope known as the atmospheric air or the atmospheric envelope which is a gaseous envelope rotating with the Earth around its axis , and it extends about 1000 km above the sea level  .

 

Thursday, July 17, 2014

The matter construction and the properties of the molecules of the matter


Carbone dioxide  molecule

 

You should know that the matter consists of very small structural units known as the molecules .

 

The molecules 

 

You should know that the molecule is the smallest part of the matter which  can exist freely , and it has the properties of the matter .

 

Tuesday, July 15, 2014

The types and the properties of the soil




The soil types
The types of the soil are the sand soil , the silt soil and the clay soil .

You can see the soil around you , and you will notice the different crops which are planted in the different types of the soil .

 

What are the types of the soil ?

 

You should know that the soil can be classified into three different types according to the kind of the particles ( the components ) that form it .

 

Sunday, July 13, 2014

The electric circuits and the methods of connecting the electric lamps in the electric circuits



 
The electric circuit

The electric circuits

 

You should know that the electric circuit is known as a closed and continuous path through which , the electricity  will pass making a complete cycle .

 

Saturday, July 12, 2014

Metals and non metals and the economic importance of some metals and non metals



Metals and non - metals

Every day , we can see the matter around us which has a mass and a volume . The matter may exist as an element or a compound .

 

You should know that the element is the simplest form of the matter that can not be analyzed into two substances or more .

Thursday, July 10, 2014

The energy paths through the living organisms in the food chains and the food webs


 
The food chain

You should know that there are food relations between all the living organisms .

 

We have known that the living organisms are classified according to their feeding into the producers which depend on themselves to make their food such as the green plants and the green algae .

 

Wednesday, July 9, 2014

The type of the living organisms according to their feeding


  
The living organisms

You should know that the living organisms are classified according  to their feeding into the producers , the consumers and the decomposers .

Monday, July 7, 2014

What is the difference between the physical changes and the chemical changes ?


The Physical  and the Chemical changes of the matter

The matter changes

You know that the changes that may occur to the matter are the physical changes and the chemical changes .

Sunday, July 6, 2014

The movement of the moon and the occurrence of the tide and the ebb phenomenon


The Moon

At night , When you look at the sky , You see the Moon , It is the satellite of the Earth . It is a dark body , But it seems bright because it reflects the sunlight which falls on its surface . 

 

Friday, July 4, 2014

The movement of the Sun and the Earth


Look at the sky , and you will notice that the Sun rises from the east and sets from the west .

 

You should know that the sunrise and the sunset do not occur due to the rotation of the Sun , but it occurs due to the rotation of the Earth around itself ( its axis ) .

 

Wednesday, July 2, 2014

The weather factors and the importance of the weather prediction


What is the meaning of the weather ?

 

You should know that the weather is the expected conditions of the atmosphere at a certain area during a short period of time , not exceeding one week .

 

Tuesday, July 1, 2014

The components of the Earth's atmosphere and the importance of them


Do you know what is the Earth's atmosphere ?

 

You should know that the Earth's atmosphere is composed of a mixture of the different gases that make the life on the Earth possible .

 

Monday, June 30, 2014

The forms of the energy and their changes


 
The forms of energy

If you  look around you , You will notice that every thing needs the energy to do their functions . You need food to obtain the energy that helps you to work ,  move , play , .....etc .

 

Your car needs the fuel to obtain the energy that causes the motion of its engines . 

 

Tuesday, June 17, 2014

The advantage and the disadvantage of friction and the ways to decrease the friction



The friction force
The friction force helps us to walk  .

Do you know what is the meaning of the friction ?

 

You should know that the friction force is the force exists between  the two  surfaces when they touch each other and it affects in the opposite direction of the movement . 

 

Sunday, June 15, 2014

The soil pollution and the soil protection from pollution



The pollution is very dangerous , and you should know that there are different kinds of pollution as the air pollution , the water pollution and  the soil pollution , The pollution is any change in the environment that disturbs its natural balance .

Saturday, June 14, 2014

The sources of energy and their importance



We have known that the Sun is the main source of energy , and it is very important in our life .

 

But you should know that there are resources of energy which are the renewable sources of energy and the non renewable sources of energy

 

Friday, June 13, 2014

What is the importance of the Sun ( solar energy ) ?



The Sun
The Sun is very important in our life .

Do you see the Sun in the sky in the morning everyday ?

 

Do you know the importance of the Sun ?

 

Everybody know that the Sun is the main source of the  energy on Earth .

 

Wednesday, June 11, 2014

The types of the levers and the importance of each of them



The levers

 

People use the levers but they do not know the type of them and how to determine the type of any lever .

 

Do you know that the levers are classified according to the location of the effort force , the resistance force and the fulcrum ?

 

Sunday, June 8, 2014

The structure and the importance of the levers


 
the lever
The levers are very important in our life to perform tasks more easily .

The levers are the most common simple machines which they help man to perform heavy tasks easily . They were first described in 260 B.C .

 

Saturday, June 7, 2014

Observing the space and the invention of Telescopes


 
Galileo's telescope
Galileo used lenses to collect light in his telescope .

Who was the first scientist who made astronomical telescope ?

 

" Galileo " was the first scientist who made an astronomical telescope in 1609 . It was made from lenses to collect light in his telescope . 

 

Wednesday, June 4, 2014

Uses of fluorescent lamps and their structure


 

the fluorescent lamps
fluorescent lamps are used in lighting houses and shops .

There are different types of electric lamps , but the most popular of these lamps are  Fluorescent lamps and light bulbs   .

 

Fluorescent lamps are type of lighting lamps known as neon lamps , but the inert neon gas is not used inside its glass tube .

 

Sunday, June 1, 2014

Uses of light bulbs and their structure


 
light bulbs are used in lighting houses
Light bulbs ate used in lighting houses .

Electric lamps are tools that convert the electric energy into light energy by passing the electricity through them .

 

There are different types of electric lamps , but the most popular of these lamps are light bulbs and fluorescent lamps .

 

Saturday, May 31, 2014

The volcanoes and the safety precautions must be taken at the occurrence of the volcanoes .



Volcanoes eruption damage towns and villages .
Lava ( lava flows ) are molten materials mass that spreads on the volcanic sides .

There are thousands of volcanoes on the Earth's surface . But sixty one only of them are active as an evidence of the permanent activities and movement beneath the Earth's crust . 

Wednesday, May 28, 2014

Earthquakes and safety precautions must be taken at the occurrence of earthquakes


Earthquakes has damage effects on the roads

Earthquakes are rapid and successive shakes of the ground which take place one after the other . 

 

Every day , the Earth's crust is exposed to nearly 400 earthquakes . actually we do not feel them , but the seismic and remote sensation detecting centers record and track them .

Monday, May 26, 2014

Mechanical waves and some technological applications of sound mechanical waves


 
Wave motion

Do you know that Mechanical waves  are waves which propagate through a material medium ( solid , liquid , or gas ) at a wave speed which depends on the  properties of that medium ?

 

Saturday, May 24, 2014

Examples and some technological applications of electromagnetic waves



 
Electromagnetic waves
Light , microwaves , x - rays , TV and radio transmissions are all kinds of electromagnetic waves .

Electromagnetic waves are formed when an electric field couples with a magnetic field . The magnetic and electric fields of an electromagnetic waves are perpendicular to each other and to the direction of the wave .

 

Friday, May 16, 2014

The lunar eclipse and safety precautions on observing the lunar eclipse


 
The types of lunar eclipses  .

Do you know that The lunar eclipse occurs when the Sun , Earth and the Moon are nearly on one straight line with the Earth in the middle hiding the sunlight from the Moon  ?

 

Do you know that the lunar eclipse occurs in the middle of the lunar month ( the moon phase is full moon )  at a rate of two lunar eclipses per year ? .

 

Thursday, May 15, 2014

The types of the solar eclipses and safety precautions on observing the solar eclipse


 
In Total solar eclipse we can not see the Sun copletely .

The solar eclipse phenomenon occurs when the Moon passes between the Sun and the Earth casting its shadow on the Earth's surface , where the moon ,the Earth and the Sun are nearly on one straight line with the moon in the middle . 

 

Tuesday, May 13, 2014

The solar system and the milky way galaxy



The Earth is the planet where we live on and has the highest density in the inner planets .

The galaxy that our solar system belongs to is known  as " The way of chopped hay galaxy " or " The Milky Way galaxy " It takes an oval shape with coiled spiral arms extend from it , the Sun lies on one of these spiral arms . The solar system consists of the Sun , the Planets , the Moons , the Asteroids , the Meteors , the Meteorites and the Comets .

 

Sunday, May 11, 2014

Benefits and dangers of electricity


 
Electricity

You should know that electricity is very important in our life . Everyone needs electricity . We can not imagine our life without it , So it also has benefits and dangers . We must know how to deal with it .