How can doing something for someone else to relieve stress?

a. it you become numb to social issues.
b. it gets your mind off your own troubles.
c. it can get you time off from work or school.
d. it you to sleep better.

Which is one way that sinkholes can form? a) tornadoes touch down and destroy trees and brush b) rivera overflow during a storm and wash away nearby land c) rainwater flows away from a depression in the ground d) groundwater dissolves the limestone and other rocks in the ground