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A meteorite is a natural
object originating in outer space that survives an impact with the
Earth's surface. Meteorites that are recovered after being
observed as they transited the atmosphere or impacted the Earth are
called falls. All other meteorites are known as finds.
Meteorites have traditionally been divided into three broad categories: stony
meteorites ; iron meteorites and, stony-iron meteorites contain
large amounts of both metallic and rocky material.
Eightfive percent of the meteorites that fall on Earth are chondrites,which
are named for the particles composed mostly of
silicate minerals and are often considered to be "the
building blocks of the planets".
Eight percent of the meteorites are achondrites, that are also ancient rocks, and are thought to represent crustal
material of asteroids. One of these groups comes from the Moon, The other group is
almost certainly from Mars
Five percent of meteorites are iron meteorites with
intergrowths of iron-nickel alloys, such as kamacite and taenite.and are thought to come from the core of a number of asteroids that
were once molten.
One per cent are of meteorites are
Stony-iron, a mixture
of iron-nickel metal and silicate minerals. One type, called pallasites, is
thought to have originated in the boundary zone above the core regions where
iron meteorites originated. The other major type of stony-iron meteorites is
the mesosiderites.
Tektites are not themselves meteorites, but are rather natural glass
objects up to a few centimeters in size which were formed--according to most
scientists--by the impacts of large meteorites on Earth's surface.
Chondrites, Tektites,
Mesosiderites, Pallasites, Achondrite and Iron meteorites
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