Geysers, such as Castle Geyser in Yellowstone National Park, are driven by thermal energy from Earth’s interior. How do you think structures like these are made?

Geography

The second one. this is because the crust is thin, while the mantle is the thickest layer. also, the core is the highest in temperature because of all the pressure from the other layers, so it's solid iron and nickel.

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evidence that early humans migrated from asia to north america was found in alaska and  
b. siberia