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Outer layer of Earth is called ________

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Answer
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Hint: It is the most widely studied and understood layer that you live on.

Complete answer:
The outer layer of the Earth is called the crust. It is known to be the solid layer of the Earth. It is formed by the solidification of the molten lava, so the rocks contain silicate and aluminum.

Additional information:
Earth is made up of several layers. Each layer exhibits its own properties, composition, and characteristics that affect many of the key processes of our planet. The layers are (from the exterior to the interior) the crust, the mantle, the outer core, and the inner core.
The Earth's Crust is thin in comparison to the other three layers like the skin of an apple. Oceanic crust is only about 3-5 miles (8 kilometers) thick under the oceans and the continental crust is 25 miles (32 kilometers) thick under the continents. The temperatures of the crust vary from air temperature on top to the deepest parts of the crust to about 1600 degrees Fahrenheit (870 degrees Celsius).

So, the correct answer is crust.

Note: The crust of the Earth is broken into many pieces called plates. A soft, plastic mantle is located below the crust where these plates "float". These plates usually move along smoothly but sometimes they stick and build up pressure resulting into the bending of rocks until it snaps. When this occurs, an Earthquake is the result!
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Fig: Layers of the Earth