If you could add a small explanation it would help a lot! Thanks!!

Groundwater has more advantages and uses than others.

Explanation:

Groundwater is a better option since this is thermal energy, that is, it is an energy transfer, it transfers and filters through the soil until it reaches the rocky material that is saturated with water. Groundwater slowly moves to lower levels creating a balance between average energy and filtration, generally rises slightly in temperature at steep angles (due to gravity), and eventually reaches streams, lakes, and oceans.

It has advantages

Explanation:

Groundwater moves to lower levels creating a balance between average energy and filtration. Then it rises and reaches lakes, oceans, etc.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

the mantle

explanation:

earth is divided into three layers: the crust or the outermost layer on which we live; the underlying, middle layer - the mantle - and the core (the innermost layer of earth).