Answer:
Doppler effect is a change in frequency and wavelength of a wave. It is caused by the change in distance between the thing creating the wave (causer) and whatever is measuring seeing or hearing the wave (watcher or observer). Another word for "causer" is "sender".
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Answer:
Explanation:
In critical conditions since when a forest is cut down if it rains the land is not in a condition for trees to flourish since every time it rains you will see a flood devastating any plant that tries to grow.
Answer:
It is predominantly solid but in geological time it behaved as a viscous fluid.
Explanation:
