Deciduous trees, such as maple and elm trees, regularly drop their leaves in a response to a change in the environment. what event causes deciduous trees to do this?

An uplifted block of rock between two normal faults

Awoman stands a distance d from a loud motor that emits sound uniformly in all directions. the sound intensity at her position is an uncomfortable 2.0×10-3 w/m2. at a distance 2.6 times as far from the motor, what are (a) the sound intensity and (b) the sound intensity level relative to the threshold of hearing?

Which is not true about oxygen-17 and oxygen-18?