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Chapter 16 Science 6th Grade
6th Grade Science Voc.
14
Science
6th Grade
02/23/2009

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Term
geocentric
Definition
a model of the universe in which Earth is at the center of the revolving planets and stars
Term
heliocentric
Definition
a model of the solar system in which Earth and the other planets revolve around the sun
Term
ellipse
Definition
an oval shape, which may be elongated or nearly circular
Term
moon
Definition
a natural satellite that revolves around a planet
Term
greenhouse effect
Definition
the process by which heat is trapped in the atmosphere by water vapor, carbon dioxide, methane, and other gases that form a “blanket” around Earth
Term
gas giant
Definition
the name often given to the first four outer planets
Term
ring
Definition
a thin disk of small ice and rock particles surrounding a planet
Term
comet
Definition
a loose collection of ice, dust and small rocky particles, typically with a long, narrow orbit of the sun
Term
asteroid
Definition
rocky objects revolving around the sun that are too small and numerous to be considered planets
Term
asteroid belt
Definition
the region of the solar system between the orbits of Mars and Jupiter, where many asteroids are found
Term
meteoroid
Definition
a chunk of rock or dust in space
Term
meteor
Definition
a streak of light in the sky produced by the burning of a meteoroid in Earth’s atmosphere
Term
meteorite
Definition
a meteoroid that passes through the atmosphere and hits Earth’s surface
Term
extraterrestrial life
Definition
life that exists other than that on Earth
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