Sound velocity, Nature and properties of sound waves
The sound The sound is an external factor that affects the ear causing the sense of hearing. and it is produced due to the vibration of the bodies and it stops when the vibrating...
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Importance of fossils and Suitable conditions for fossils formation
Suitable conditions for the formation of fossils The organism’s body must be buried immediately after death in a medium that preserves it from decomposition, The organism must have a hard skeleton, A suitable medium...
Types of fossils and ways of formation, Cast types, Mold & Petrified fossils
Fossils 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 their activity during their life and the...
Water pollutants, water pollution disadvantages and protection of water from the pollution
The water pollution 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 living...