Due to plate tectonics, the width of the Atlantic Ocean is separating at a rate about the same as the growth of
  • no molten core
  • human fingernails
  • sedimentary rock
  • seafloor spreading
The extremely deep ocean Marianas Trench is a result of
  • differentiated
  • seafloor spreading
  • subduction
  • fault
The slowly increasing distance between South America and Africa is due to
  • differentiated
  • Seafloor crust
  • seafloor spreading
  • Van Allen Radiation Belts
A hot, molten body of different materials will become ________.
  • differentiated
  • seafloor spreading
  • no molten core
  • continental crust
The Dynamo Theory holds that:
  • the altitude most commercial jet airplanes fly.
  • is temporarily absorbed by greenhouse gases and then reemitted in random directions
  • magnetic fields are generated by rapidly spinning, fluid magnetic interiors.
  • the iron and nickel core is denser than the silicate mantle and crust.
The earthquakes that occur in Southern California generally occur above a _______.
  • fault
  • Van Allen Radiation Belts
  • hot spot.
  • subduction
If seismometers registered P- and S-waves everywhere on the Moon, they would suggest that the Moon had
  • Seafloor crust
  • no molten core
  • sedimentary rock
  • differentiated
Which of the following statements would be true if there were no greenhouse effect?
  • It is returned upward in the form of infrared light.
  • The clouds reflect much of it back to space, though some still reaches the surface.
  • inner core: about 1%outer core: 15%mantle: 80%crust: 1%
  • There would be no life on Earth.There would be no liquid water on Earth.The temperature on Earth would be much colder.
If there were significantly more greenhouse gases, such as CO2, in Earth's atmosphere, then
  • the altitude most commercial jet airplanes fly.
  • inner core: about 1%outer core: 15%mantle: 80%crust: 1%
  • It is returned upward in the form of infrared light.
  • Earth's average temperature would change.
Australia is composed of relatively old and thick
  • differentiated
  • continental crust
  • chunk of black volcanic rock.
  • sedimentary rock
On a day with complete cloud cover, what happens to the visible light headed toward Earth?
  • It reaches Earth's surface, where some is reflected and some is absorbed.
  • The clouds reflect much of it back to space, though some still reaches the surface.
  • the iron and nickel core is denser than the silicate mantle and crust.
  • the altitude most commercial jet airplanes fly.
estimate the fractions of Earth's volume represented by --- the inner core.the outer coremantlecrust
  • The clouds reflect much of it back to space, though some still reaches the surface.
  • It is returned upward in the form of infrared light.
  • It reaches Earth's surface, where some is reflected and some is absorbed.
  • inner core: about 1%outer core: 15%mantle: 80%crust: 1%
A planetary atmosphere with ozone could protect surface dwellers froma) ultraviolet radiation.b) charged particles in the solar wind. c) meteor impacts.d) optical radiation.e) radar waves.
  • Van Allen Radiation Belts
  • a) ultraviolet radiation.
  • b) the Earth's oceans would be frozen.
  • c) water vapor and carbon dioxide.
Without the greenhouse effect in our atmospherea) we would not have to worry about ecological problems.b) the Earth's oceans would be frozen. c) the amount of nitrogen & oxygenwould be much less.d) the icecaps would have melted. e) global warming would still occur.
  • b) the Earth's oceans would be frozen.
  • c) water vapor and carbon dioxide.
  • Earth's average temperature would change.
  • inner core: about 1%outer core: 15%mantle: 80%crust: 1%
__________ found in the Atlantic Ocean between North America and Europe is composed of dense and relatively young rock
  • no molten core
  • seafloor spreading
  • Seafloor crust
  • sedimentary rock
Old Faithful Geyser at Yellowstone National Park in the United States acquires its energy from a
  • fault
  • hot spot.
  • no molten core
  • human fingernails
Layered _______ exposed by erosion can be seen when looking at the Grand Canyon in the United States.
  • no molten core
  • sedimentary rock
  • human fingernails
  • Seafloor crust
Earth's average density is about the same as that of
  • continental crust
  • the iron and nickel core is denser than the silicate mantle and crust.
  • Van Allen Radiation Belts
  • chunk of black volcanic rock.
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