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Glossary of Terms for Earth Science Chapter 1 Activity 4 (Book 2)

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asteroid
rocky body smaller than a planet
asteroid belt
located between the orbits of Jupiter and Mars, where many asteroids can be found
largest asteroid
Ceres - 1,000 km across
closest recent Earth - approaching asteroid
1994 XM 11
Chicxulub
an asteroid that hit Earth 65 million years ago and killed the dinasaurs - 170 km wide (asteroid 10 km wide) in Mexico
Haughton Crater
crater created on Devon Island in North America
Meteor Crater
(Arizona) formed 49,000 years ago (1.2 km diameter)
Aorunga
located in Chad, AFrica (Sahara)created several hundred million years ago (17 km diameter)
Wolf Creek Crater
crater formed in Australia 300,000 years ago (.29 km diameter)
two lakes in Quebec
(clearwater lakes) formed by two colliding objects 290,000,000 years ago [smaller - 22km, bigger - 32 km]
meteroids
pieces of asteroids
meteors
meteoroids that enter Earth's atmosphere
meteorites
meteors that hit Earth's surface
chondrites
most common form of meteorites, although some are made of iron
comets
masses of fronzen gases (ices) and rocky dust particles
cause of tail of comet to point away from Sun
radiation pressure and the action of solar wind
solar winda
a flow of hot charged particles leaving the Sun

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