Both Radioactive dating of rocks retrieved from the world and Comparing cratering rates on one world to those on another.
Geologists can find the relative age of impact craters on a world because
the ones on top must be younger.
Scientists know the history of Earth's magnetic field because the magnetic field gets frozen into rocks, and plate tectonics spreads them out.
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Answer:
Han?
Explanation:
If by civilizations you mean ethnic groups it would be the Han.
Answer:
Explained
Explanation:
The melted magma or partially melted rock rise or intrude the surrounding rocks because of the buoyancy. The partially melted rocks or magma due their high temperature become less dense than the surrounding rocks and rise up. And then these heated rock or magma react with surrounding rocks which in turn increases the pressure in the magma chamber. This intermixing of magma with surrounding rocks forms another type of rocks called igneous rocks.