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Desert
In geography, a desert is a
landscape form or region
that receives very little
precipitation. Generally
deserts are defined as areas
that receive an average
annual precipitation of less
than 250 mm (10 inches). The
... > full story
Dust storm
A dust storm (or sandstorm
in some contexts) is a
meteorological phenomenon.
Such a storm is usually the
result of convection
currents created by intense
heating of the ground. ... > full story
Groundwater
Groundwater is water located
beneath the ground surface
in soil pore spaces and in
the fractures of geologic
formations. A formation of
rock/soil is called an
aquifer when it can yield a
useable quantity of water.
... > full story
Savanna
A savanna or savannah is a
grassland with widely spaced
trees, and occurs in several
types of biomes. In
savannas, grasses and trees
are co-dominant vegetation
types, with trees and
grasses often alternating in
... > full story
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Microorganism
A microorganism or microbe is an organism that is so small that it is microscopic (invisible to the naked eye). Microorganisms are often illustrated using single-celled, or unicellular organisms; ... > more -
Earthquake liquefaction
Earthquake liquefaction, often referred to simply as liquefaction, is the process by which saturated, unconsolidated soil or sand is converted into a suspension during an earthquake. The effect on ... > more
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