Volcanic eruption. a solidified lava flow will devoid plants of necessary soils in which to grow.
Answer:
C
Viruses need a host to survive.
Explanation:
Geothermal energy comes from the heat within the earth. The word "geothermal" comes from the Greek words geo, meaning earth," and therme, meaning "heat."
Energy input would be what's giving the source energy. Energy output is what energy it's giving out.