Plate Tectonic

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Across
  1. 2. A weak point in the Earth's crust and upper mantle where the rock layers have ruptured and slipped.
  2. 4. A vent (opening) in the surface of the Earth through which magma erupts; it is also the landform that is constructed by the erupted material.
  3. 7. A measure of the effects of an earthquake at a particular place on humans, structures and (or) the land itself.
  4. 10. The term used for magma once it has erupted onto the Earth's surface.
  5. 14. A measure of the strength of an earthquake or strain energy released by it, as determined by seismographic observations
  6. 15. The circular depression containing a volcanic vent.
  7. 18. Shaking of the Earth caused by a sudden movement of rock beneath its surface.
  8. 19. Fragments less than 2 millimeters (about 1/8 inch) in diameter of lava or rock blasted into the air by volcanic explosions.
  9. 20. The innermost layers of the Earth
Down
  1. 1. The layer of rock that lies between the crust and the outer core of the Earth. It is approximately 2900 kilometers thick and is the largest of the Earth's major layers.
  2. 3. A medium-colored dark gray volcanic rock
  3. 5. An abrupt movement of soil and bedrock downhill in response to gravity. Landslides can be triggered by an earthquake or other natural causes. Undersea landslides can cause tsunamis.
  4. 6. hat point within the Earth from which originates the first motion of an earthquake and its elastic waves; where the break in the fault actually occurred.
  5. 8. Term used to describe volcanic rock or magma composed chiefly of dark-colored, iron- and magnesium-rich minerals.
  6. 9. That point on the Earth's surface directly above the hypocenter of an earthquake.
  7. 11. A steep-sided mount that forms when very viscous lava is extruded from a volcanic vent.
  8. 12. The thin outer layer of the Earth's surface
  9. 13. Dark-colored, low viscosity volcanic rock
  10. 16. An earthquake which follows a larger earthquake or main shock and originates in or near the rupture zone of the larger earthquake
  11. 17. Molten rock containing liquids, crystals, and dissolved gases that forms within the upper part of the Earth's mantle and crust. When erupted onto the Earth's surface, it is called lava.