Layers of the Earth

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Across
  1. 3. 5 to 70 km thick; also known as the surface; where we live
  2. 6. Brittle upper part of crust; contains most of Earth's rocks, feeds plants
  3. 7. Entirely iron; 5200°C; pressurized into a solid
  4. 8. 40km thick; makes up the continents; 200-400°C
  5. 9. 2200km thick; iron and nickel; flows as a liquid; Earth's magnetic field
Down
  1. 1. Magnesium, iron, silicon; moves heat from the core to planet
  2. 2. Causes continental drift; Earth is the only planet with one
  3. 4. 500-900°C; drives plate tectonics
  4. 5. Volcanic and igneous rock; made of melted mantle, hydrothermal current