<P> The crust of the Earth is composed of a great variety of igneous , metamorphic , and sedimentary rocks . The crust is underlain by the mantle . The upper part of the mantle is composed mostly of peridotite , a rock denser than rocks common in the overlying crust . The boundary between the crust and mantle is conventionally placed at the Mohorovičić discontinuity , a boundary defined by a contrast in seismic velocity . The crust occupies less than 1 % of Earth 's volume . </P>
<P> The crust of the Earth is composed of a great variety of igneous , metamorphic , and sedimentary rocks . The crust is underlain by the mantle . The upper part of the mantle is composed mostly of peridotite , a rock denser than rocks common in the overlying crust . The boundary between the crust and mantle is conventionally placed at the Mohorovičić discontinuity , a boundary defined by a contrast in seismic velocity . The crust occupies less than 1 % of Earth 's volume . </P>
what is found in the earth 's crust
what is found in the earth 's crust
variety of igneous , metamorphic , and sedimentary rocks
variety of igneous , metamorphic , and sedimentary rocks