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Why is earth geologically active?
1- Internal Structure: -
-Core: The highest density material; consists primarily of metals such as iron and nickel.
- Mantle: Rocky material that have medium density- mostly minerals such as silicon and oxygen, forms the thick mantle that covers the core.
- Crust: The lowest density rock, such as granite and basalt (volcanic rock) forms the thin crust that essentially covers the world's outer skin
- A planet's lithosphere is its outer layer of cool, rigid rocks.
2- Internal heat is the primary driver of geological activity, because the heat supplies the energy needed to move rock and re-shape the surface. Heat travels in the mantle through convection.
3- Magnetic field: is generated by the motions of molten metal in the earth's liquid outer core