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Section One: Volcanoes and Earthquakes

Across
The point of an earthquake within Earth where rupture first occurs to cause an earthquake
The point on Earth's surface directly above the focus of an earthquake
A fixed source of abundant rising magma that forms a volcanic center that has persisted for tens of millions of years
Naturally occurring molten rock material generated within Earth
A rigid, thin segment of the crust and part of the upper mantle. This can be assumed to move horizontally and adjoins other plates
A sudden motion or shaking in Earth, caused by the abrupt release of slowly accumulated strain
A continuous mountain range extending through the North and South Atlantic Oceans, the Indian Ocean and the South Pacific Ocean
A general term for elastic waves in Earth produced by Earthquakes or generated artificially by explosions
Down
The deep central cleft in the crest of the mid-ocean ridge
Earth's crust and the uppermost part of the mantle
A Vent in the surface of Earth through which magma and associated gases and ash erupt
A theory in which the lithosphere is divided into a number of plates that move relative to one another
A scientist who studies the materials, processes and history of Earth
An elevation of the seafloor 1000 m or higher either flat-topped or peaked
Fluid rock that comes out of a volcano