The types of sound waves
Sound waves 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...
Author: Heba Soffar
Nature and the properties of the sound waves
The sound 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...
The importance of the fossils and the suitable conditions for the fossils formation
The suitable conditions for the formation of the fossils The organism body must be buried immediately after death in a medium that preserves it from the decomposition, The organism must have a hard skeleton,...
The types of fossils and the ways of formation
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 pollutants and the protection of the water from the pollution
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...
The physical and the chemical properties of the water
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...
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