Select all that apply
which of the following are sources of sulfur dioxide?

*engine exhaust
*domestic heating
*volcanic eruptions
*forest fires
*photosynthesis

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