Across
- 2. plates slide past each other.
- 3. colliding or coming together
- 5. the theory that Earth’s outer crust (lithosphere) is divided into several plates that glide over the plastic-like and less rigid asthenosphere.
- 7. plate boundaries divide or move apart.
- 8. Pulls on the crust, stretching rock so that it becomes thinner in the middle.
- 9. oceanic crust sinks beneath a trench
- 11. heat from the sun
- 13. As tectonic plates slowly move away from each other, heat from the mantle's convection currents makes the crust more plastic and less dense.
- 14. heat transfers through gases and liquids
- 15. theory continents were once joined together like a jigsaw puzzle.
Down
- 1. theory that explained how continents shift position on Earth's surface.
- 4. Transfers energy in the mantle.
- 6. squeezes rock until it folds or breaks.
- 10. molecules transfer heat.
- 12. stress that pushes a mass of rock in two opposite directions