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You have the core, then you have the crust which is the outermost layer :)

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Q: What is the topmost layer of the earth spelled with only four letters?
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What is the earth layer?

In 1942 the geophysicist Keith Bullen published a paper describing the earth's internal layering in which he used letters to designate various layers from the surface to the core. In this scheme, the earth's lower mantle was known as the D layer.


What is the Earth's D layer?

In 1942 the geophysicist Keith Bullen published a paper describing the earth's internal layering in which he used letters to designate various layers from the surface to the core. In this scheme, the earth's lower mantle was known as the D layer.


What is the thinest layer of earth called?

The crust is the thinnest layer of the earth


What is the layer of the earth that is composed of water?

The hydrosphere is the layer of Earth composed of water.


Which layer of earth's atmosphere protect the earth from the dangerous ultraviolet?

The ozone layer