Geosphere. 7 th Period. Earthâ€™s Composition and Structure. The composition and structure of Earth are very different among the numerous layers. The differentiation of the earth is due to the occurrences in the formation of the solar system 5.5 billion years ago. EARTHâ€™S COMPOSITIONAL
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The composition and structure of Earth are very different among the numerous layers. The differentiation of the earth is due to the occurrences in the formation of the solar system 5.5 billion years ago.
-Asthenosphere: the major importance of this layer is to hold the earth’s tectonic plates.
-This layer is the upper part of the mantle.
It is very hot but not liquid at a temperature of 1600 degrees Celsius
-And this layer is roughly 250km thick
-Earths tectonic plates are huge and have jagged edges.
-They move very slowly at an inch per year if that
-Most geologic activity occurs at plate boundaries
-Convection current deep in the mantle causes the plates to move
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