Author Question: Basalt plateaus erupt from ____. A)supervolcanoes B)shield volcanoes C)fissures D)lava domes ... (Read 124 times)

londonang · **on:** Jul 13, 2018

Basalt plateaus erupt from ____.
A)supervolcanoes
B)shield volcanoes
C)fissures
D)lava domes
E)cinder cones

Question 2

Briefly explain the difference between the tectonic setting of shield areas during the Precambrian and since the onset of the Phanerozoic.

bob · **Reply #1 on:** Jul 13, 2018

Answer to Question 1

C

Answer to Question 2

During the Precambrian, the areas that are now part of the shield were tectonically active with volcanism, metamorphism, and folding and faulting. During that time, continents grew by accretion. Since the beginning of the Phanerozoic, these areas have been tectonically inactive and have been eroded to topographically flat, stable areas.