Earth's outer layer is composed of seven dominant plates. what is the name of this rigid outer layer?

I believe the correct answer is lithosphere. The Earth's outer layer that is composed of seven dominant plates is the lithosphere.  Earth's lithosphere includes the crust and the uppermost mantle, which constitute the hard and rigid outer layer of the Earth. The lithosphere is subdivided into tectonic plates.

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Answer mauritania is in the northwestern part of african, meaning its in the western hemisphere, and how do i know/ the map showed me so; ///: )