earths thin, rocky crust is composed of silicon, aluminum, calcium, sodium and potassium. The answer to this question depends on whether we want to know which chemical elements, minerals or rock types it is made of. Earth's crust is composed of iron, oxygen, silicon and magnesium.
The crust is underlain by the mantle. The lithospheric plates lie on a layer of softer, more plastic mantle rock called the asthenosphere ("weak layer"). Plates are thicker than the crust and consist of the crust plus the shallow mantle just beneath it. It may be surprising but about a dozen chemical elements, minerals, or rock types is all that it takes to describe approximately 99% of the crust. earths thin, rocky crust is composed of silicon, aluminum, calcium, sodium and potassium. The crust is of two different types. The crust and tectonic plates are not the same. Below the crust is the mantle.The crust and the upper mantle make up the lithosphere.The lithosphere is broken up into tectonic plates that can move.. It is less than 1% of Earth's volume. This stiff and brittle two-layered combination is called the lithosphere ("stony layer" in scientific Latin).
The crust is compositionally distinct outermost rocky layer of the Earth. In geology, a crust is the outermost layer of a planet. The crust of the Earth is composed of a great variety of igneous, metamorphic, and sedimentary rocks. The Earth's crust is the Earth's hard outer layer. Earth's crust ranges from 3 to 44 miles deep, and it is almost the only source humans have for obtaining minerals. Other elements are also present in small amounts, including sulfur, nickel, copper and calcium. The crust is made up of different types of rocks: igneous, metamorphic, and sedimentary rocks. What is the crust made of? The upper part of the mantle is composed mostly of peridotite, a rock denser than rocks common in the overlying crust.
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