Glossary

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Subject:

a rift in the surface of the Earth caused by divergent tectonic plates

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a cone with the line from the vertex to the centre of the base perpendicular to the base.

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(also called a rectangular prism) a 3D form in which all the faces are rectangular.

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a pyramid with its vertex directly above the centre of its square base.

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any triangle that contains one angle of 90º.

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