Across
- 3. - A dark, organic material that forms in soil when plant and animal matter decay.
- 6. waves - Transverse waves.
- 11. - One of the two main types of elastic body waves.
- 12. - a large natural elevation of the earth's surface rising abruptly.
- 13. - A soft, loose, earthy material.
- 16. - A rich, crumbly soil with almost equal parts of sand and silt, and some clay.
- 17. Spreading - The formation of new areas of oceanic crust.
- 18. of fire - A long horseshoe-shaped active belt of earthquake epicentres, volcanoes, and tectonic plate boundaries that fringes the Pacific basin.
- 19. - The upper layer of the earth's mantle, in which there is relatively low resistance to plastic flow and convection.
- 20. Plates - A massive slab of solid rock, mostly composed of both continental and oceanic lithosphere.
- 23. A long, narrow depression on the seafloor that forms at the boundary of tectonic plates where one plate is pushed, or subducts, beneath another.
- 24. - A mountain where hot vapor, and gas are being or have been erupted from the earth's crust.
- 25. - The outer shell of a terrestrial planet.
- 26. Boundaries - These occur when two tectonic plates move away from each other.
- 27. Drift - A gradual movement of the continents across the earth's surface through geological time.
- 30. Currents - A current in a fluid that results from convection.
- 31. Core - liquid, an iron-nickel layer of the Earth between the solid inner core and lower mantle.
- 33. - A force along the length of a medium, especially a force carried by a flexible medium, such as a rope or cable.
Down
- 1. - The sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
- 2. - Pressing or Squeezing something together.
- 4. A material composed of minerals, living organisms, soil organic matter, gas, and water.
- 5. - The mostly solid bulk of Earth's interior.
- 6. Waves- A seismic wave that travels along or parallels the earth's surface
- 7. Bounderies - Places where plates slide sideways past each other.
- 8. Boundaries - When two plates come together.
- 9. wave - An elastic wave in the earth produced by mostly earthquakes.
- 10. - A zone of fractures between two blocks of rock.
- 14. Core - A hot and dense ball made up of mostly iron.
- 15. - Depressed areas of land that are washed out by the conspiring forces of gravity, water, and ice.
- 21. - A long high sea wave caused by an earthquake, submarine landslide, or other disturbance.
- 22. - What happens when two blocks of the earth suddenly slip past one another.
- 28. - The solid outer part of the earth.
- 29. - the change of shape, without change of volume, of a layer of the substance, produced by a pair of equal forces acting in opposite directions along the two faces of the layer.
- 32. - A supercontinent that incorporated most of the landmasses on Earth.