📖 what
What is the asthenosphere?
Quick Answer
The asthenosphere is a soft, slowly flowing layer of the upper mantle beneath the lithosphere that lets tectonic plates move.
The Full Story
The asthenosphere lies below Earth’s rigid lithosphere and behaves like a very hot, weak solid that can deform over long timescales. It is not fully liquid, but its rock is hot enough and under enough pressure to flow slowly. This layer helps decouple tectonic plates from the deeper mantle, making plate motion possible. Seismic evidence for the asthenosphere comes from the way earthquake waves slow down in this zone.
Key Facts
1.It lies beneath the lithosphere
2.It is part of the upper mantle
3.Its rocks deform over geologic time, not like a liquid in the everyday sense
YouTube Angle
Suggested video title for this topic:
"The soft layer that lets continents drift"
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