Volcanic rocks are
A) Crystallized from magma at or near the earth's surface.
B) By definition, only those produced by conelike volcanic structures.
C) Coarse-grained because the magmas typically spend so long inside the volcano before eruption.
D) All of the choices are correct.
Correct Answer:
Verified
Q13: The low-viscosity,fluid lava of hot-spot volcanoes is
Q14: The 1883 Krakatoa,Indonesia eruption is more accurately
Q15: Volcanic ash
A) Is composed of microscopic shards
Q16: The Pacific Ring of Fire is
A) A
Q17: A hot,glowing cloud of gas and ash
Q19: Mafic magmas
A) May contain up to about
Q20: The rock type that forms at new
Q21: Each volcano has a characteristic eruptive style;
Q22: To halt a pyroclastic flow,one could use
Q23: The path of a lava flow can
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