Which kind of waves are generated in brain during deep sleep

What types of waves are generated during earthquakes ?

What kind of sound waves are produced in air ?

What kind of waves are sound waves produced in air ?

What kind of waves that can survive as standing wave ?

What kind of changes are take place during photosynthesis?

Drug which depresses brain activity and produces feeling of calmness, relaxation, drowsiness and deep sleep is :

Which kind of nuclear reaction is currently used to generate electrical energy?

What kind of wood is formed during spring?