Which statement most accurately compares Earth’s crust and Earth’s mantle?
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To compare Earth's crust and Earth's mantle, we need to understand their characteristics. The Earth's crust is the outermost layer of the Earth and is composed of solid rocks, minerals, and sediments. It is relatively thinner compared to the mantle and has a variable thickness ranging from about 5-70 km.
The Earth's mantle, on the other hand, lies below the crust and extends to a depth of about 2,900 km. It is composed of solid rocks that are rich in iron and magnesium minerals. The mantle is much thicker and denser compared to the crust.
Now, to compare the two, we can consider the following statements:
1. Thickness: The crust is thinner, ranging from 5-70 km, while the mantle is significantly thicker, extending to a depth of about 2,900 km.
2. Composition: The crust is composed of a variety of rocks and sediments, while the mantle is predominantly made up of solid rocks rich in iron and magnesium minerals.
3. Density: The mantle is denser than the crust due to the higher presence of heavy minerals, such as iron and magnesium.
Therefore, based on the characteristics mentioned above, the statement that most accurately compares Earth's crust and Earth's mantle would be:
"The Earth's crust is thinner, less dense, and composed of a variety of rocks and sediments, while the mantle is significantly thicker, denser, and predominantly composed of solid rocks rich in iron and magnesium minerals."