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