Plate Tectonics and Continental Drift Voc Set 2

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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 DriftVoc Set 2Asthenosphere
  • 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
  • breaks like a solid
  • (sort of like molten glass, but MUCH hotter)Did you know?
  • Temperatures in the asthenosphere:
  • 1400-3000 degrees celsius(the surface of the Sun is about 5000 C)Lithosphere
  • the outermost layer of the Earth, including the crust and uppermost, solid portion of the mantle
  • Did you know?
  • Lithosphere means “ball of stone” in Greek
  • Did you know?
  • The lithosphere is a very thin layer – only about 1000 km (620 miles) thick.
  • Ridge
  • a line or range of hills or mountains, or an elongated elevation on the ocean bottom
  • 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!
  • Trench
  • a long, steep-sided valley on the ocean floor that happens when one plate subducts under another
  • Did you know?
  • The oldest ocean floor crust is found at subduction zones, where old crust will be recycled back into magma.
  • Did you know?
  • Trenches are usually found near volcanic island arcs.
  • Examples:
  • Fault
  • a break in the Earth's crust where rocks will slide past each other
  • Did you know?
  • Fault lines are frequent sites of earthquakes.
  • Did you know?
  • Fault lines are frequent sites of earthquakes.
  • Rift Valley
  • a long, deep valley formed by two tectonic plates moving away from each other
  • 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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