What are some examples of rocks that are not formed by the rock cycle?
1 Answer
Mar 16, 2016
Just a couple that I can think of - moon rocks and meteorites.
Explanation:
The Apollo moon mission in the early 70;s brought back hundreds of pounds of rocks from the moon that were never part of Earth's rock cycle. And, its not clear if the Moon ever had a rock cycle of its own, though it did have volcanism.
Meteorites would be the other rocks not part of the rock cycle, though once they land on Earth, they become part of the rock cycle.
Many meteorites are leftover material from the formation of the solar system and a few are thought to actually be from Mars!
