Understanding Earth's Interior Composition and Magma Generation

The Earth's interior comprises the lithosphere, asthenosphere, outer core, and inner core, heated by radioactive decay and residual heat. The lithosphere is rigid, while the asthenosphere beneath can flow plastically. Magma is generated at mid-ocean ridges, hotspots, and subduction zones, where plate boundaries interact. Away from plate boundaries, no magma is generated.

• Earths Interior
• Lithosphere
• Asthenosphere
• Magma Generation
• Plate Boundaries

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2. Lithosphere Asthenosphere The interior of the Earth is hot due to decay of radioactive minerals and residual heat from Earth s formation Outer core (liquid) Inner core (soild) Crust and mantle are solid rock not liquid

3. Lithosphere the rigid outer part of the Earth made from the crust and upper parts of the mantle which mechanically acts as a single unit. The lithosphere is brittle and cannot flow. Asthenosphere the upper mantle below the lithosphere which is ductile and can flow plastically but is still a solid.

4. Average section of crust and mantle (i.e. away from plate boundaries) No magma generated

5. Magma generated 1. Mid ocean ridge

6. Magma generated 2. Hotspot

7. 3. Subduction zone Magma generated

8. d) c) b) a)