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hart_molly3
ID:
274883
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flashcards
Updated:
2014-05-22 08:13:07
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Earth space science
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questions 1 - 49
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  1. what is the crack in the ocean floor through which magma rises?
    a rift
  2. according to Wegener, what happened about 250 million years ago?
    the supercontinent began breaking into smaller continents
  3. tectonic plates are blocks
    lithosphere
  4. at the center of a mid-ocean ridge is a(n)
    rift valley
  5. the composition of Earths interior affects
    the speed and direction of seismic waves
  6. Which scale more accurately measures the magnitude of large earthquakes?
    Richter scale
  7. If you are tn a" aar during an earthquake, youshould
    stop the car in a safe place
  8. what happens to tsunamis as they move toward shore?
    They increse in height.
  9. If you are in indoors during an earthquake, you should
    stay away from windows.
  10. Which of the following is NOT a cause of tsunamis?
    tornado
  11. If you are indoors during an eathquake, you should
    crouch under a desk.
  12. How does the structure of Earth' s interior affect seismic waves?
    It can affect the speed and direction of seismic waves.
  13. Which of the following are studied to forecast earthquakes?
    seismic gaps, foreshocks, rock changes
  14. Why do earthquakes usually occur at plate boundaries?
    Rock in environments near tectonic plate boundaries experience great stress.
  15. S waves are also known as
    shear waves.
  16. Fault zones form a tplate boundaries because
    intense stress occurs therc when the platesseparate, collide, subdufrt, or slide past eachother.
  17. What forms on the oceanl floor in a subduction zone?
    trench
  18. Volcanic eruptions may be signaled by
    caldera
  19. A large depression formed by the collapse of a volcanic cone is called a
    caldera
  20. Volcanic ash, dust, blocks, bombs, and lapilli ara all
    pyroclastic materials
  21. The eruption of Mount St. Helens was
    en explosive eruption.
  22. Three events that might signal a volcanic eruption aro changes in earthquake activity, volcano surface bulges, and
    a sulfuric odor
  23. Modsrn oceanography began with
    the HMS challenger
  24. most mid-ocean ridges form
    in areas of increased volcanic activity
  25. a piece of sediment collected by drilling a
    core sample
  26. the most common compounds im organic sediments are
    silica and calcium carbonate
  27. to calculate the depth of the ocean floor with sonar, scientists measure
    the time it takes sound waves to travel
  28. the source of most calcium carbonate in biogenic sediments is
    foraminnferans
  29. most oxygen enters the ocean form
    the atmosphere
  30. what is called the foundation of life in the ocean
    plankton
  31. the ocean is the main source of the trace minerals
    chloride and sodium
  32. most offshore oil and peroleum deposits are found
    on the continental shelf
  33. in addition to increase usr of toxic chemicals, what has reduced the ocean's abilitly to renew itself
    increase world population
  34. in addition to limiting the use of leaded gasoline, what has the united stares done to reduce ocean pollution
    bannes the toxic chemical DDT
  35. trace elements in the ocean are those minerals that are
    smalest in amount
  36. volcnaic eruptions chemical weathering rock on land and chemical reaction between sea water and nexly formed sea-floor rocks provide most of the raw elements that form this dissolved solid in the oceam
    sea salts
  37. where would a tidal bore occur?
    where a river enters the ocean
  38. the curving of the path of ocean currents and wind belts is called?
    the Coriolis effect
  39. the force that causes tides is
    gravity
  40. very large waves are usually the result of
    a long fetch
  41. in the tropical latitudes, trade-wind belts push currents
    westward
  42. sandbars are formed by
    longshore currents
  43. as lower layers of air are warmed
    the air rises
  44. what air masses generally moce eatward, toward Europe
    maritime poplar Atlantic
  45. a large body of air throughout which temperature and moisture content are similar is an
    air mass
  46. continental polar, maritime polar, continental tropical, and maritime tropical are types of
    are massses
  47. Doppler radar and satellite images provide information to create
    weather model
  48. a pattern of meteorological symmbols that represent the weather at a particular abserving station is a
    station model
  49. when air moves slowly, it takes on the temperature and hummidity of its region, becoming an
    air mass

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