Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Earth's crust Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Earth's crust Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English Simple English