Question

Which of these surface features are formed because of the heating of groundwater?

wells and streams

sinkholes and caves

hot springs and geysers

stalactites and stalagmite

Answer 1

Just for anyone who happens to see this question, this isn't exactly physics - but we lack a group that this would fit perfectly in - so I'm going to leave it be for now.

Cheers.

Answer 2

hint: look and see if any of the answers can be created without heated groundwater.

Answer 3

Or think about which one involves heated water :)