What is the thickest layer of the Earth's four layers?
The second layer of the Earth is the mantle. It lies between Earth's dense, super-heated core and its thin outer layer, the crust. Measuring 1,800 miles in depth, the mantle is the thickest part of the Earth’s layers, making up a whopping 84% of Earth’s total volume. The mantle can be described as an underground ocean of liquid rock! In fact, lava that comes from volcanoes comes from the mantle. The temperature of the mantle varies greatly, from 1800°Fahrenheit near its boundary with the crust, to 6600° Fahrenheit near its boundary with the core.
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