Why is the Earth layered and how is each layer different?
The Earth having layer is a theory, there is no real reason for it to be layered, but each layer is believe to be different in composition, temperature and in state.
The mantle is a semi-liquid, semi-solid rock known as magma that has a thickness of up to 2,900 km. It is cooler and harder nearer the crust and hot and liquid like nearer the core. This semi-solid rock can have convection currents form in it, which is a factor of continental drift, caused by the radioactive processes that occur in the core that release heat which causes the currents. The crust is the habitable layer of Earth that we live upon, which is between 0 and 60 km thick, which is divided into "tectonic plates" that all of the continents sit upon.
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The Earth is layered due to differentiation during its formation. Layers are the crust, mantle, outer core, and inner core. Composition, temperature, and physical state vary between layers.
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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.
When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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