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52 Matching questions

  1. supernova
  2. moon
  3. sediment
  4. expanding Universe theory
  5. stellar wind
  6. wave
  7. Universe
  8. lithosphere
  9. asthenosphere
  10. Meteorite
  11. metal
  12. nebula
  13. vacuum
  14. protoplanetary disk
  15. Solar System
  16. Moho
  17. planetesimal
  18. groundwater
  19. big bang
  20. fault
  21. galaxy
  22. magnetic field
  23. atmosphere
  24. lower mantle
  25. earthquake
  26. rock
  27. mantle
  28. Earth System
  29. crust
  30. upper mantle
  31. geothermal gradient
  32. star
  33. glass
  34. core
  35. wavelength
  36. cosmology
  37. planet
  38. topography
  39. organic chemical
  40. red shift
  41. asteroid
  42. meteor
  43. bathymetry
  44. Melt
  45. transition zone
  46. protoplanet
  47. nebula theory
  48. comet
  49. gas-giant planet
  50. differentiation
  51. Mineral
  52. protostar
  1. a The theory that the whole Universe must be expanding because galaxies in every direction seem to be moving away from us.
  2. b A carbon-containing compound that occurs in living organisms, or that resembles such compounds; it consists of carbon atoms bonded to hydrogen atoms along with varying amounts of oxygen, nitrogen, and other chemicals.
  3. c Molten (liquid) rock.
  4. d A cloud of gas or dust in space.
  5. e A large sphere, composed dominantly of hydrogen and helium, in which fusion reactions are producing energy.
  6. f The study of the overall structure of the Universe.
  7. g The thick layer of rock below the EarthÕs crust and above the core.
  8. h A solid composed almost entirely of atoms of metallic elements; it is generally opaque, shiny, smooth, and malleable, and can conduct electricity.
  9. i The phenomenon in which a source of light moving away from you very rapidly shifts to a lower frequency; that is, toward the red end of the spectrum.
  10. j Tiny, solid pieces of rock and metal that collect in a planetary nebula and eventually accumulate to form a planet.
  11. k The outer planets (Jupiter, Saturn, Uranus, Neptune) that are very large and consist mostly of volatile elements.
  12. l The deepest section of the mantle, stretching from 670 km down to the core-mantle boundary.
  13. m The flattened cloud of dust, gas, and ice that orbits a nascent star prior to the formation of planets.
  14. n The horizontal difference between two adjacent wave troughs or two adjacent crests.
  15. o The middle portion of the mantle, from 400 to 670 km deep, in which there are several jumps in seismic velocity.
  16. p Space that contains very little matter in a given volume (e.g., a region in which air has been removed).
  17. q A means of transmitting energy from one location to another; waves can be vibrations that propagate through a material, or undulations of electromagnetic fields that can propagate either through a material or in a vacuum.
  18. r The relatively rigid, non-flowable, outer 100- to 150-km-thick layer of the Earth; constituting the crust and the top part of the mantle.
  19. s A homogenous, naturally occurring, solid inorganic substance with a definable chemical composition and an internal structure characterized by an orderly arrangement of atoms, ions, or molecules in a lattice. Most minerals are inorganic.
  20. t A fracture on which one body of rock slides past another.
  21. u The rate of change in temperature with depth.
  22. v A body that grows by the accumulation of planetesimals but has not yet become big enough to be called a planet.
  23. w Variations in elevation.
  24. x Variation in depth.
  25. y The seismic-velocity discontinuity that defines the boundary between the EarthÕs crust and mantle.
  26. z An accumulation of loose mineral grains, such as boulders, pebbles, sand, silt, or mud, that are not cemented together.
  27. aa A cataclysmic explosion that scientists suggest represents the formation of the Universe; before this event, all matter and all energy were packed into one volumeless point.
  28. ab A ball of ice and dust, probably remaining from the formation of the Solar System, that orbits the Sun.
  29. ac Water that resides under the surface of the Earth, mostly in pores or cracks of rock or sediment.
  30. ad A dense body of gas that is collapsing inward because of gravitational forces and that may eventually become a star.
  31. ae An object that has entered a planetÕs atmosphere and is glowing and evaporating as it streaks to the planetÕs surface.
  32. af A vibration caused by the sudden breaking or frictional sliding of rock in the Earth.
  33. ag A solid in which atoms are not arranged in an orderly pattern.
  34. ah The region affected by the force emanating from a magnet.
  35. ai One of many millions of small, rocky, and/or metallic objects that orbit the Sun, consisting of fragments of once-larger planetesimals, or chunks of protoplanetary material; most lie in the region between Mars and Jupiter.
  36. aj The rock that makes up the outermost layer of the Earth.
  37. ak The uppermost section of the mantle, reaching down to a depth of 400 km.
  38. al In the context of planet formation, the process by which a planet separates into a metallic core and a rocky mantle very early in its history.
  39. am An immense system of hundreds of billions of stars.
  40. an The global interconnecting web of physical and biological phenomena involving the solid Earth, the hydrosphere, and the atmosphere.
  41. ao The dense, iron-rich center of the Earth.
  42. ap A piece of rock or metal alloy that fell from space and landed on Earth.
  43. aq The Sun and all the objects that orbit it (including planets, moons, comets, and asteroids).
  44. ar The concept that planets grow out of rings of gas, dust, and ice surrounding a new-born star.
  45. as A layer of gases that surrounds a planet.
  46. at The layer of the mantle that lies between 100-150 km and 350 km deep; the asthenosphere is relatively soft and can flow when acted on by force.
  47. au A coherent, naturally occurring solid, consisting of an aggregate of minerals or a mass of glass.
  48. av Particles that have been ejected from a star and are shooting through space.
  49. aw The sum of all matter and energy making up the hundreds of billions of known galaxies.
  50. ax A short-lived, very bright object in space that results from the cataclysmic explosion marking the death of a very large star; the explosion ejects large quantities of matter into space to form new nebulae.
  51. ay A solid object of ice and/or rock and metal that orbits a planet.
  52. az A relatively large, spherical object that orbits a star and has cleared its orbit of most debris.