The densest material is closest to the center.
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Therefore, it probably has a core of metal, a mantle of dense rock, and a crust of less-dense rock. The core, like that of Earth, is probably composed primarily of iron and nickel, although Venus’s somewhat lower density may indicate that its core also contains some other, less-dense material such as sulfur.
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The Mantle. Divided into two parts: Upper mantle . Lower mantle. Most of the mantle is solid rock. The lower mantle rock is softer. It makes up 85% of the Earth’s mass. Temperatures can reach up to 870 C. 1,800 miles thick
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Dec 05, 2002 · An alternative theory is that bits of the core have become mixed with mantle rock, forming an iron and silicon slurry that would be less dense than the mantle material. "Because the plume should drag up bits of the dense layer, we should be able to find evidence of its composition in the flood basalts associated with hot spots," Jellinek said.
Mantle The next layer of the Earth is called the mantle. The mantle is much thicker than the crust at almost 3000km deep. It's made up of slightly different silicate rocks with more magnesium and iron. Tectonic plates The tectonic plates are a combination of the crust and the outer mantle, also called the lithosphere.
Upper Mantle (Rigid Mantle) is part of the Lithosphere Plastic-like portion of the mantle is called the Asthenosphere This part of the mantle is responsible for our plates moving on the surface Convection occurs in this part of the Earth Study of P and S waves 80% of the interior of the Earth The Mantle Tuesday, December 15, 2009