Chapter 7, Problem 1VSC

To determine

The crater forming first.

Answer to Problem 1VSC

Solution:

Option (a)

Explanation of Solution

Given info: Label $1a$ lies on the rim of a large crater and label $1b$ lies on the rim of a smaller one.

The crater represented by $1a$ is a large crater as compared to crater $1b$ . The crater $1a$ was having a flat surface. This indicates that the preexisting features must have wiped out.

So, the crater $1a$ was formed first and then crater $1b$ was formed inside the crater $1a$ .

Therefore, the correct option is (a).

The crater $1b$ is deeper than $1a$ it was formed after crater $1a$ .

Both craters were not formed at the same time. The crater $1b$ is deeper than a crater $1a$ .

Therefore, option (c) is not correct.

Conclusion:

Label $1a$ lies on the rim of a large crater and label $1b$ lies on the rim of a smaller one.