The Moon, like Earth, was formed about 4.5 billion year ago. The Moon’s heavily cratered highlands are made of rocks. The darker volcanic plains of the maria however, are than the cratered highlands.

younger

Explanation:

The highlands are light and heavily created places on the moon and they are of several kilometers larger than maria. Thought the moon and the earth have were formed about the 4.5 billion years ago the volcanic plains are younger and more recent origin than those of the created highlands that are made up of rocks.