Why should a student on a field trip in Yosemite National Park assume that a piece of rock, that when under a microscope shows tiny crystals, is basalt?
A) Basalt forms in lava flows.
B) Basalt forms underground.
C) Basalt is green.
D) Basalt is always hot.

Question

Quizplus · Accepted Answer

Basalt is a volcanic rock that forms from lava flows, making it a common rock type found in areas with past or present volcanic activity such as Yosemite National Park. Under a microscope, basalt typically displays tiny mineral crystals. The other options are not true characteristics of basalt.

Why Should a Student on a Field Trip in Yosemite