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A ____ is either in the pressure reducer or in the downstream side of the system to ensure that the control air pressure does not exceed about 30 psig.
Plate Tectonics
A scientific theory explaining the movement of the Earth's lithosphere, which is divided into tectonic plates, over the more fluid asthenosphere.
Asthenosphere
The highly viscous, mechanically weak, and ductilely-deforming region of the upper mantle of the Earth, which lies just below the lithosphere.
Plate Boundary
The region where two tectonic plates meet, which can be characterized by seismic activity, mountain building, and volcanic eruptions.
Divergent Plate Boundary
A boundary where tectonic plates are moving away from each other, often resulting in the creation of new crust as magma rises and solidifies.
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