Plate tectonics
Across
- 3. a linear zone where the Earth's crust.
- 5. A steep-sided mount that forms when very viscous lava is extruded from a volcanic vent.
- 6. the solid outer layer of the earth.
- 9. Pertaining to igneous rock bodies that form at great depth.
- 10. The opening at the Earth's surface through which volcanic materials (lava, tephra, and gases) erupt. Vents can be at a volcano's summit or on its slopes; they can be circular (craters) or linear (fissures).
- 13. the thin, almost liquid, layer under the hard rock that forms the outer layer of the earth.
- 16. A written record of an earthquake, recorded by a seismograph.
- 18. The term used for magma once it has erupted onto the Earth's surface.
- 19. forms when blobs of gas-charged lava are thrown into the air during an eruption and cool in flight, falling as dark volcanic rockcontaining cavities created by trapped gas bubbles.
- 20. Used loosely as a collective term for all consolidated pyroclastic rocks.
Down
- 1. the part of the earth that surrounds the central core.
- 2. the round hole at the top of a volcano, or a hole in the ground similar to this.
- 4. the distance between the top and the bottom of a wave.
- 7. a narrow hole that is dug into the ground.
- 8. That point within the Earth from which originates the first motion of an earthquake and its elastic waves.
- 11. To bend or change direction.
- 12. To bounce back from a surface.
- 14. One of the huge sections which make up the Earth's crust.
- 15. Term used to describe volcanic rock or magma composed chiefly of dark-colored, iron- and magnesium-rich minerals.
- 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.