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 molten lava that solidified quickly with gas bubbles trapped inside. The fact that they are present among the lunar rock samples indicates that lava once flowed over the lunar surface, providing evidence for past volcanic activity on the Moon.

The Presence of Vesicular Basalts Among the Lunar Rock Samples