What type of air mass usuallu contains the most moisture

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

Where is the potential energy throughout the loading, cocking, and releasing of the trebuchet?

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in