Science Crossword
Across
- 3. the sideways and downward movement of the edge of a plate of the earth's crust into the mantle beneath another plate.
- 4. In geology, a fault is a planar fracture or discontinuity in a volume of rock across which there has been significant displacement as a result of rock-mass movements.
- 5. Boundary- Convergent (Colliding): This occurs when plates move towards each other and collide. When a continental plate meets an oceanic plate, the thinner, denser, and more flexible oceanic plate sinks beneath the thicker, more rigid continental plate.
- 6. the upper layer of the earth's mantle, below the lithosphere, in which there is relatively low resistance to plastic flow and convection is thought to occur.
- 8. Crust- the relatively thick part of the earth's crust that forms the large landmasses. It is generally older and more complex than the oceanic crust.
- 12. spot- In geology, hotspots are volcanic locales thought to be fed by underlying mantle that is anomalously hot compared with the surrounding mantle. Examples include the Hawaii, Iceland, and Yellowstone hotspots.
- 13. 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.
- 17. Pangaea or Pangea was a supercontinent that existed during the late Paleozoic and early Mesozoic eras.
- 18. any of the world's main continuous expanses of land (Africa, Antarctica, Asia, Australia, Europe, North America, South America).
- 20. Boundaries- A plate boundary is a three-dimensional surface or zone across which there is a significant change in the velocity (speed or direction) of motion of one lithospheric plate relative to the adjacent lithospheric plate.
- 21. Boundary- A transform fault or transform boundary, is a fault along a plate boundary where the motion is predominantly horizontal. It ends abruptly where it connects to another plate boundary, either another transform, a spreading ridge, or a subduction zone.
Down
- 1. Boundary- where new crust is generated as the plates pull away from each other. Convergent boundaries -- where crust is destroyed as one plate dives under another. Transform boundaries -- where crust is neither produced nor destroyed as the plates slide horizontally past each other.
- 2. the rigid outer part of the earth, consisting of the crust and upper mantle.
- 7. A mountain range or hill range is a series of mountains or hills ranged in a line and connected by high ground. A mountain system or mountain belt is a group of mountain ranges with similarity in form, structure, and alignment that have arisen from the same cause, usually an orogeny.
- 9. a straight line or narrow section through an object or natural feature or across the earth's surface, along which observations are made or measurements taken.
- 10. Tectonics- a theory explaining the structure of the earth's crust and many associated phenomena as resulting from the interaction of rigid lithospheric plates which move slowly over the underlying mantle.
- 11. Ranges- a mountain or hill, typically conical, having a crater or vent through which lava, rock fragments, hot vapor, and gas are being or have been erupted from the earth's crust.
- 14. The epicenter is the point on the earth's surface vertically above the hypocenter (or focus), point in the crust where a seismic rupture begins.
- 15. Crust- the relatively thin part of the earth's crust which underlies the ocean basins. It is geologically young compared with the continental crust and consists of basaltic rock overlain by sediments.
- 16. Waves- an elastic wave in the earth produced by an earthquake or other means.
- 19. a long, narrow ditch.