The strongest of evidence that supports the giant impact model for the formation of the Moon is that the

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The overall composition of moon rocks returned from the Apollo program being similar to the composition of Earth's mantle material except for the lack of volatile elements is a key piece of evidence that supports the giant impact model. This is because this model suggests that the Moon formed from the debris generated by a giant impact between the proto-Earth and a Mars-sized object. The material ejected by the impactor would have come from the Earth's mantle, and that material ended up forming the Moon. The fact that the Moon's overall composition is similar to Earth's mantle material supports this theory. The lack of volatile elements in the Moon's composition is also consistent with the giant impact model, as these elements would have been lost during the high-energy impact that formed the Moon.

The Strongest of Evidence That Supports the Giant Impact Model