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Asthenosphere - Evidence For The Existence Of The Asthenosphere, Properties Of The Asthenosphere, The Asthenosphere In Plate Tectonic Theory

earth planet layer structure

The asthenosphere is the layer of Earth situated at an average depth of about 62 mi (about 100 km) beneath Earth's surface. It was first named in 1914 by the British geologist Joseph Barrell, who divided Earth's overall structure into three major sections: the lithosphere, or outer layer of rock-like material; the asthenosphere; and the centrosphere, or central part of the planet. The asthenosphere gets its name from the Greek word for weak, asthenis, because of the relatively fragile nature of the materials of which it is made. It lies in the upper portion of Earth's internal structure traditionally known as the mantle. Scientists have not seen the asthenosphere of Earth, but its existence has a profound effect upon the planet and the manner in which the Earth's crust behaves. For anyone living near a plate boundary on Earth, the asthenosphere contributes mightily to the uneasy geologic conditions which may plague the area.


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over 9 years ago

Helpfull - but does not explain the heat source of the Asthenosphere.

It can't be just pressure as various layers below (hense more pressure) this sphere are not semi liquid - some are solid.

It can't be just radioactive decay as other sphere's also have this action.

It can't be just gravity from Moon and Sun that causes this sphere to be hot, as gravity affects the whole earth and the centre of the earth is solid.

So what is it???

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almost 9 years ago

The heat from the asthenosphere comes from a combination of the incredible pressure caused by the gravitational force as well as the slow decay of radiactive isotopes from radiactive materials in the earth's interior.

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about 2 years ago

It was 100% unhelpful! I wanted to know facts about the actual layer not who discovered it! So useless!

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over 2 years ago

ughh... got damn

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almost 2 years ago

dos not tell me about the scientist ways of determining what it is.