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The central part of the earth, beginning at a depth of about 2900 km, probably consisting of iron-nickel alloy; it is divisible into an outer core that may be liquid and an inner core about 1300 km in radius that may be solid.
Industry:Natural environment
A scientist who studies the origin, history, structure, and processes of the earth.
Industry:Natural environment
Slow movement along a fault that does not produce earthquakes.
Industry:Natural environment
Structures whose functioning during an emergency is essential or whose failure would endanger many lives. May include: structures such as nuclear power plants or large dams whose failure could be catastrophic; major communication, utility, and transportation systems; involuntary or high occupancy buildings such as prisons or schools; emergency facilities such as hospitals, police and fire stations, and emergency-response facilities.
Industry:Natural environment
Related to the use of scientific methods and engineering principles to acquire, interpret and apply knowledge of earth materials to solving engineering problems.
Industry:Natural environment
The outermost major layer of the earth; ranging from 35 to 45 km thick and with a compressional seismic wave velocity (in rock) between 3.0 and 7.5 km/s.
Industry:Natural environment
A moving mass of rock fragments, soil, and mud, more than half ofthe particles being larger than sand size.
Industry:Natural environment
A block of the earth's crust, usually elongated, that has subsided relative to adjacent rocks along bounding faults.
Industry:Natural environment
