The presence of vesicular basalts among the lunar rock samples shows that
A) the lunar surface was fragmented by meteorite impacts.
B) volcanism did not occur on the moon.
C) the crust must have been made of anorthosite.
D) molten lava once flowed over the lunar surface.
E) the moon was once hit by a very large meteorite.

Question

Quizplus · Accepted Answer

Vesicular basalts are formed from lava flows with trapped gases, indicating that molten lava once flowed over the lunar surface. Option A may also be a possible inference, but it does not relate specifically to the presence of vesicular basalts. Options B, C, and E are incorrect as they are contradicted by the presence of vesicular basalts.

The Presence of Vesicular Basalts Among the Lunar Rock Samples