In class, we studied the small hard rock-like matter which is flung great distances when a volcano erupts. What is the name of this substance?

Q. In class, we studied the small hard rock-like matter which is flung great distances when a volcano erupts. What is the name of this substance?

A. Lava

B. Magma

C. Tephra

D. Pahoehoe

Answer: Tephra