What is true of both earthquakes and volcanoes?
a.) they are caused by movement of tectonic plates.
b.) they are potentially devastating to local environments.
c.) they occur inland less frequently than along coasts.
d.) all of the above are true of both earthquakes and volcanoes.

All of the above are true of both earthquakes and volcanoes

Further Explanation:

Volcanoes and Earthquakes are related to each other in some way or the other as most of the earthquakes take place around the edges of the tectonic plates and tectonic plates are the ones where the Volcanoes are active too. But, it is the interaction tectonic plates which are the major reason behind the cause of earthquakes and not by magma. The majority of earthquakes occur just below the volcanoes and volcanoes take place because of the movements of magma.  

It is the magma which exerts the pressure on the rocks and it happens till the rock get cracked and after that, magma squirts into the cracks and then it starts to build pressure again and every time that with every rock cracking up, a small earthquake takes place but the intensity of these earthquakes is very low and are very weak to be felt and can be recorded only by the sensitive instruments.  

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Answer Details:

Grade: High School

Chapter: Earthquakes and Volcanoes

Subject: Geography

Keywords: Geography, Volcanoes, Earthquakes, Magma, Tectonic plates, Edges, movement, rock cracks, Pressure.