What are the sources of carbon dioxide gas?
Carbon dioxide gas is very necessary for the photosynthesis process of green plants to make their own food, and to build their bodies, It is a chemical compound which its molecule consists of one...
Category: Earth and Universe
The properties, source and cycle of oxygen gas
The atmosphere contains oxygen gas that necessary for the respiration process, It is a mixture of gases surrounding the Earth, It is attracted to Earth by gravity, It protects the Earth by absorbing ultraviolet...
What are the properties of the soils?
The properties of the soils The sand soil is well-aerated soil that has low absorption of the water, The clay soil is poorly aerated soil that has a high absorption of the water, and...
The soil layers and the living organisms
The soil is composed of three layers, They are the top soil layers, the lower soil layers and the rocky layers, The soil horizon is the layer that parallel to the soil crust and...
The formation and the importance of the soil
The importance of the soil The soil is the main component of the environment as it is necessary for all the living organisms (the plants, the animals and the human), the plants take the...
What are the components of the soil?
The soil is a thin non-compacted superficial layer which covers the Earth crust, and it is a very important part of the environment, There are different types of the soil that are different in...
