The Fossils The fossils are the traces and the remains of the living organisms which are preserved in the sedimentary rocks, The traces of once old living organisms indicate its activity during its life...
The water pollution The water pollution is the addition of any substance to the water which causes a continuous gradual change in the water properties and affects the health and the life of the...
Physical properties of the water 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...
The importance of the water There are no living organisms can live without the water as it is the medium through which all the vital processes take place, The water in the oceans and...
The global warming phenomenon The global warming is caused by the greenhouse effect, It is the continuous increase in the average temperature of the Earth’s near-surface air, The increase of the concentration of carbon...
The erosion of the ozone layer The ozone hole is a thinning or losing parts of the ozone layer above the south pole, The scientists have noticed that there was the erosion of the...
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