Everything except for the crust, including the Mantle and the core.
The mantle stretches down 2,890 kilometers, making it the Earth's thickest layer and the core that can be studied only by indirect means.
What are the layers of earth?
The layers of earth can be defined as the layer which is present inside the earth surface.
There are basically three different layers of earth.
Crust - It is defined as the a rocky planet's, dwarf planet's, or natural satellite's outermost solid shell.
Mantle - It is defined as the thick layer of heated, solid rock between the Earth's crust and the molten iron core.
Core - It is defined as the center of gravity where all the movements begins.
Thus, the mantle stretches down 2,890 kilometers, making it the Earth's thickest layer and the core that can be studied only by indirect means.
To learn more about the layers of earth, refer to the link below:
https://brainly.com/question/18696113
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The Earth’s core is the layer studied indirectly, consisting of the outer core, which is liquid, and the inner core, which is solid. Scientists rely on seismic waves to gather information about these layers since direct access is impossible. This research enhances our understanding of key geological processes and the Earth's magnetic field.
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