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Shaanxi Earthquake
The Shaanxi earthquake or Hua County Earthquake is the deadliest earthquake on record, killing approximately 830,000 ... > more -
Soil contamination
Soil contamination is the presence of man-made chemicals or other alteration to the natural soil environment. This type of contamination typically arises from rupture of underground storage tanks, ... > more -
Biodiversity hotspot
A biodiversity hotspot is a biogeographic region that is both a significant reservoir of biodiversity and is threatened with destruction. The term biodiversity hotspot specifically refers to 25 ... > more -
Pyroclastic flow
Pyroclastic flows are a common and devastating result of some volcanic eruptions. They are fast-moving fluidized bodies of hot gas, ash and rock (collectively known as tephra) which can travel away ... > more -
New Madrid Seismic Zone
The New Madrid Seismic Zone, also known as the Reelfoot Rift or the New Madrid Fault Line, is a major seismic zone located in the Midwestern United ... > more -
Ocean surface wave
Ocean surface waves are surface waves that occur at the surface of an ocean. They usually result from distant winds or geologic effects and may travel thousands of miles before striking land. They ... > more
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