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15 Cards in this Set

  • Front
  • Back
attraction between bodies of matter
gravity
stony or metallic mass that orbits the sun
asteroid
icy body moving through outer space
comet
large mass of ice that flows downslope or outward due to the internal stresses caused by its own weight
glacier
the gaseous envelope around the Earth composed chiefly of nitrogen and oxygen. average weight of atmos. on earth's surface: 14.7 lb/in ^2
atmosphere
processes that loosen, dissolve, and wear away earth materials. active agents include gravity, streams, glaciers, winds, and ocean waves
erosion
temp. scale that divides the interval between freezing and boiling points of water into 100. C + 5/9 (F-32)
centigrade
temp scale where the boiling point of wwater is 212 and freezing is 32. F + 9/5 (C + 32)
fahrenheit
combining of smaller atoms to make larger atoms with resultant release of energy
nuclear fusion
energy emitted from the sun mostly in the infrared, visible, and untraviolet wavelengths
solar radiation
the largest zone of the earth comprising 83% by volume and 67% by mass
mantle
central zone/nucleas of the earth about 2900 km (1800 mi) below the surface, made mostly of iron and nickel, it exists as a solid inner zone surrounded by a liquid outer shell. earth's magnetic field originates from within it
core
unstable elements containing excess subatomic particles that are emitted to achieve smaller, stable atoms
radioactive elements
breakdown of unstable atomic nuclei by emission of particles or radiation. decay process produces smaller atoms and gives off heat
radioactivity
outermost layer of lithosphere, composed of relatively low-density materials. continental __ is lover density than oceanic __
crust