Answer:
Rays
Step-by-step explanation:
The moon was formed about 4.5 billion years ago according to most accepted Giant-impact theory. The Lunar surface has shows the following surface features:
Mares-The dark areas of the moon are filled with lava. These smooth and large areas can be seen from the Earth as well. These are about 3 billion years old.
Crater- These are formed when meteoroid impacts the surface. A depression is formed. Thousands of depressions are present of moon's surface. Lundar surface is continuously bombarded by the small meteors. The largest crater is the Tycho crater.
Mountains and ranges- are the bumps on the surface of the moon. These were formed about 4 billion years ago.
Rills- the cracks present on the lunar surface due to motion of its surface.
Rays- these features were last to form. These are bright rays - streaks of debris which radiate out from large impact craters.