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Plate Tectonics and Continental Drift Voc Set 2

Plate Tectonics and Continental Drift Voc Set 2. Asthenosphere. the soft layer of the Earth on which pieces of the lithosphere move; flowing portion of the upper mantle. ???. Did you know?. The asthenosphere flows like a liquid b reaks like a solid

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Plate Tectonics and Continental Drift Voc Set 2

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  1. Plate Tectonics and Continental DriftVoc Set 2

  2. Asthenosphere • the soft layer of the Earth on which pieces of the lithosphere move; flowing portion of the upper mantle ???

  3. Did you know? • The asthenosphere • flows like a liquid • breaks like a solid (sort of like molten glass, but MUCH hotter)

  4. Did you know? • Temperatures in the asthenosphere: 1400-3000 degrees celsius (the surface of the Sun is about 5000 C)

  5. Lithosphere • the outermost layer of the Earth, including the crust and uppermost, solid portion of the mantle

  6. Did you know? • Lithosphere means “ball of stone” in Greek

  7. Did you know? • The lithosphere is a very thin layer – only about 1000 km (620 miles) thick.

  8. Ridge • a line or range of hills or mountains, or an elongated elevation on the ocean bottom

  9. Did you know? • The mid-ocean ridges of the world are all connected to make one long mountain range? • It is about 60,000 km long – that’s 37,282 miles!

  10. Trench • a long, steep-sided valley on the ocean floor that happens when one plate subducts under another

  11. Did you know? • The oldest ocean floor crust is found at subduction zones, where old crust will be recycled back into magma.

  12. Did you know? • Trenches are usually found near volcanic island arcs. • Examples:

  13. Fault • a break in the Earth's crust where rocks will slide past each other

  14. Did you know? • Fault lines are frequent sites of earthquakes.

  15. Did you know? • Fault lines are frequent sites of earthquakes.

  16. Rift Valley • a long, deep valley formed by two tectonic plates moving away from each other

  17. Did you know? • Parts of the East African Rift Valley are called the “cradle of mankind.” • The remains of “Lucy,” an early hominid that lived 3.2 million years ago, were found there!

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