The youngest rocks on the Moon are found in the maria, which are the dark, smooth plains that cover about 17% of the Moon's surface.

Here's why:

* Maria formed from volcanic eruptions: The maria were created by massive volcanic eruptions billions of years ago, when the Moon was still geologically active.

* Volcanic rocks are younger: These volcanic eruptions brought molten rock (magma) to the surface, where it cooled and solidified, forming the maria. This solidified magma is the youngest rock material on the Moon.

* Dating lunar rocks: Scientists can determine the age of lunar rocks by analyzing their composition and using radiometric dating techniques.

While the maria contain some of the youngest rocks on the Moon, it's important to note that even the youngest lunar rocks are still incredibly old, dating back billions of years.