Thursday, October 23, 2014
Monday, October 20, 2014
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
|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
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
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
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
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
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
Friday, August 22, 2014
Thursday, August 14, 2014
Monday, August 11, 2014
Saturday, August 9, 2014
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 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
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
Thursday, July 24, 2014
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
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 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
Tuesday, July 15, 2014
|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
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
Thursday, July 10, 2014
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
Monday, July 7, 2014
Sunday, July 6, 2014
Friday, July 4, 2014
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
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
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
Tuesday, June 17, 2014
Sunday, June 15, 2014
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
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
Wednesday, June 11, 2014
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 levers are very important in our life to perform tasks more easily .|