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Natural environment
Related to any physical feature of the earth's natural environment.
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Natural environment > Earthquake 
plate (tectonic)
Natural environment; Earthquake
A large unit of the earth's lithosphere that moves relative to other plates and the interior of the earth.
plate tectonics
Natural environment; Earthquake
The theory of movement and interaction of large plates of the earth's crust that explains earthquakes, volcanos and other geologic processes as consequences of the movement.
plates
Natural environment; Earthquake
Giant slabs of underground rocks, often bigger than continents.
primary wave
Natural environment; Earthquake
Fast-moving body waves that push and pull on rocks laterally; they move at 3 miles (5 km) per second.
recurrence interval
Natural environment; Earthquake
The average time between specific events at a particular site.
reflection (seismic wave)
Natural environment; Earthquake
Seismic energy that has been returned (reflected) from an interface of materials of different elastic properties.
refraction (seismic wave)
Natural environment; Earthquake
Seismic energy that has been deflected by passing from one material to another with different elastic properties.
Sub-categories
- Air (43)
- Atmosphere (59)
- Climate (1147)
- Climate change (10457)
- Coral reefs (23903)
- Deserts (738)
- Earthquake (7143)
- Flood (34)
- Forests (37)
- Grassland (35)
- Land mass (144)
- Landslide (66)
- Mountains (203)
- Plateau (39)
- Speleology (1857)
- Volcano (5852)
- Water (18527)