The importance of the water and its structure

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 .

 

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

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 .

 

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

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 .

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 .

 

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

 

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

 

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 .

 

The types and the properties of the soil

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 .

 

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

 

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 .

 

Metals and non metals and the economic importance of some 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 .

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

 

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 .

 

The type of the living organisms according to their feeding

  

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

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

The Physical  and the Chemical changes of the matter

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

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

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 . 

 

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 ) .

 

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 .

 

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 .