The earth's crust can melt under extreme conditions, such as intense heat from volcanic activity. This can lead to the formation of magma which can eventually erupt onto the surface as lava.
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The Earth's crust includes everything we know ON EARTH except for the Mantle, and core, and the elements of the mantle, and core.
Magma is fluid molten rock that exists under the Earth's crust.
Glaciers played a role in shaping the Earth's crust by eroding and transporting vast amounts of sediment, helping to create features like valleys and moraines. The weight of ice sheets also led to isostatic adjustments in the Earth's crust, influencing land elevation and shaping the landscape. Additionally, as glaciers melt, they deposit sediment that contributes to the formation of new landforms.
The answer is the asthenosphere, the crust is part of the lithosphere, which is part of the outer portion of the earth (the part we live on), the asthenosphere is just below it and the point where rocks begin to melt.