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Plate Tectonics

Across
When plates are pulled apart and form a valley
When the dense oceanic crust meets the less-dense continental crust
What each whole number on the Richter scale represents in a ten fold increase
The process of measuring the time when seismic waves from earthquakes arrive at each seismometer.
Large tidal waves
When plates slide along or grind past one another
When plates come together or converge
A strong and sudden movement in earths crust
When an earthquake happens in an area with sandy or loose soil and the ground acts like liquid.
Moves like an s-shape and can only move through solids
Down
Small ground movements
When plates diverge or spread apart
The huge slabs that Earths lithosphere is divided into
The measuring of an earthquakes magnitude
Has a push-pull action and can move through all parts of the planet.
A scientific theory explaining the structure of the earth's crust and the movements of its plates.
The waves of vibration caused by a tremor
A scientific instrument used to record the frequency and intensity of tremors.
The study of earthquakes
When large chunks of snow or ice break off and slide down hill
The point on earths surface directly above the focus of an earthquake
The place where two or more tectonic plates meet