Answer :
Final answer:
Rocks on Earth over 1-2 billion years old are rare due to geological processes like plate tectonics and erosion that continuously reshape the Earth's crust, as well as weathering and metamorphism that affect surface rocks. Subduction also plays a role in recycling older rocks back into the Earth's interior.
Explanation:
One reason it is rare to find rocks on Earth over 1-2 billion years old is due to the intense geological processes that continuously reshape the Earth's crust, such as plate tectonics, erosion, and volcanic activity, which can destroy or alter older rocks over time. Another factor is that rocks on the Earth's surface have been subjected to weathering and metamorphism, further obscuring their original age. Additionally, the process of subduction, where tectonic plates collide and one plate is forced beneath another, can cause older rocks to be recycled back into the Earth's interior.
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