Most of the Moon's surface is densely covered with craters, but we find relatively few craters within the lunar maria. What can we conclude?

A) The maria formed after the heavy bombardment ended.
B) The maria formed within the past 1 billion years.
C) The regions of the maria were hit by fewer impacts than the densely cratered regions.
D) Erosion affects the maria more than it affects other regions of the Moon.


A) The maria formed after the heavy bombardment ended.

Physics & Space Science

You might also like to view...

The more powerful the motor is

a. the longer the time interval for doing the work is. b. the shorter the time interval for doing the work is. c. the greater the ability to do the work is. d. the shorter the workload is.

Physics & Space Science

Diffraction from foghorns is best if the waves being diffracted are

A) long. B) short. C) either of these D) neither of these

Physics & Space Science

A pendulum makes 12 complete swings in 8.0 s

(a) What is its frequency? (b) What is its period?

Physics & Space Science

The magnitude of the drag force of air resistance on a certain 20.0-kg object is proportional to its speed. If the object has a terminal speed 80.0 m/s, what is the magnitude of the drag force on the object when it is falling with a speed 30

0 m/s? A) 73.5 N B) 15.0 N C) 7.50 N D) 42.7 N E) 196 N

Physics & Space Science