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Sound waves There are two types of 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 ultrasonic...
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...
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...
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...