Across
- 2. Year The distance that light travels in a vacuum in one year, equal to about 9.46 trillion km
- 3. the external force acting on an object or surface parallel to the slope or plane in which it lies
- 5. Spot A place deep within the Earth where hot magma rises to just underneath the surface, creating a bulge and volcanic activity
- 6. a sudden and violent shaking of the ground, sometimes causing great destruction, as a result of movements within the earth's crust or volcanic action.
- 8. region in a longitudinal wave where the particles are closest together.
- 11. Tectonic Theory the lithosphere of the earth is divided into a small number of plates which float on and travel independently over the mantle
- 12. Drift Theory continents are not stationary, but move across the Earth's surface.Continental drift is one feature of the modern theory of plate tectonics.
- 14. a crack in the Earth's crust.
- 15. The location where the earthquake begins.
Down
- 1. a small group of atoms or molecules
- 4. Unit a unit of measurement equal to 149.6 million kilometers, the mean distance from the center of the earth to the center of the sun.
- 7. the point on the earth's surface vertically above the focus of an earthquake.
- 9. included all the present continents, which broke up and drifted apart.
- 10. a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction.
- 13. The partial pressure of a gas, especially dissolved in a liquid