The upper layer of the Earth's crust is known as
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Together the uppermost mantle and the crust act mechanically as a single rigid layer, called the lithosphere. The lithospheric outer shell of Earth is not one continuous piece but is broken, like a slightly cracked eggshell, into about a dozen major separate rigid blocks, or plates.
Answer:
The upper layer of the Earth's crust is known as lithosphere.The lithosphere is the solid outer part of the Earth that extends to a depth of about 100 kilometers (62 mi). The lithosphere includes both the earth's crust and the brittle upper part of the mantle. The lithosphere is the coolest and most rigid layer of the Earth.
The most well-known feature associated with the Earth's lithosphere is tectonic activity. Tectonic activity describes the interaction of huge plates of the lithosphere called tectonic plates. The lithosphere is divided into 15 major tectonic plates: North America, Caribbean, South America, Scotland, Antarctica, Eurasia, Arabia, Africa, India, Philippines, Australia, Pacific, Juan de Fuca, Cocos, and Nazca.
The division of the lithosphere between the Earth's crust and mantle is called the Mohorovician discontinuity, or simply the Moho. The Moho does not exist at a uniform depth because not all regions of the Earth are equally balanced in isostatic equilibrium. Isostasy describes the physical, chemical, and mechanical differences that allow Earth's crust to sometimes "float" on the malleable mantle. The Moho is found about eight kilometers (5 miles) under the ocean and about 32 kilometers (20 miles) under the continents.
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