ASTRO-110 Lecture Notes - Lecture 9: Continental Crust, Continental Drift, Igneous Rock
22 Sep 2020
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Earth"s interior is broken into 3 parts core and molten outer core. Core high density material, consisting primarily of nickel and iron; solid inner. Mantle rocky material of moderate density- mostly silicates; forms thick. Crust lowest density rock including igneous rock; basalt and granite that forms mantle around the core a thin crust. The outer layer of earth is referred to as the lithosphere pattern. Floats above the warmer, softer rock beneath it. Beneath the lithosphere the temperature allows rock to flow and act in convection. Mantle rock flows at a rate of 10 cm a year. Most lead and heavy materials must have sunk to the core of the earth. The heat that allowed the rock to melt and the earth to be molten was because of: The impacts of accretion which created heat that melted the outer layers of. Could only have occurred if the earth was largely molten at the time.
