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how deep is the earth's crust in km how thick is the earth's crust in km how big is the earth's crust in km how long is the earth's crust in km how deep is the earth's crust in miles how thick is the earth's crust in kilometers how thick is the earth's crust in miles how big is the earth's crust in miles how long is the earth's crust in miles how many km deep is the earth's crust
