Answer:
4 billion years
Explanation:
Scientists have found the oldest known rocks on Earth. They are 4.28 billion years old, making them 250 million years more ancient than any previously discovered rocks. Earth formed about 4.6 billion years ago from a disk of gas and dust circling the sun.
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Changes in the orbit of the earth caused the ice sheets to spread across Canada.
Answer:
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Explanation:
Answer:
False
Explanation:
compressive stress produces reverse faults.