What are the causes of acid rain?

What are the limitations in obtaining energy from wind?

Give two advantages of smokeless chulhas over traditional chulhas.

Ram visited Manikaran Sahib in Himachal Pradesh where he saw an experimental geothermal plant. When he saw a hot spring,he wanted to know more about it. His father explained to him about geothermal energy and hot springs. Now answer the following questions:
$(a)$ What did Ram's father explain to him about hot springs?
$(b)$ Why is geothermal energy not generated on a large scale?
$(c)$ What is the main advantage of using geothermal energy?

State whether the following statement is true or false:
Black surfaces are poor absorbers of heat.

Choose the incorrect statement.