Science Exam / 7th Grade : Unit 3

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Science Exam / 7th Grade : Unit 3
2012-04-24 12:42:01

Science Exam 7th Grade : Unit 3
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  1. Tsunamis, electromagnetic, seismic waves, and sound waves all transfer ______

    a sound
    b energy
    c light
  2. The distance between two corresponding parts of a wave is the wave's _______

    a amplitude
    b frequency
    c speed
  3. The distance that a wave oscillates from the resting position is the _______

    a amplitute of the wave
    b wavelength of the wave
    c frequency of the wave
    amplitude of the wave
  4. Water waves are produced when what is transferred from wind and earthquakes?

    a matter
    b light
    c energy
  5. Sand bars and longshore drift are both examples of ____

    a tsunamis causing erosion
    b tides changing the sea level
    c waves creating new beaches
    waves creating new beaches
  6. Nuclear reactions in the sun produce large amounts of____

    a light and sound energy
    b heat and light energy
    c heat and chemical energy
    heat and light energy
  7. Sound waves are produced by what?

    a objects in outer space
    b light strking an object
    c vibrations
  8. Sound waves can travel through _____

    a solids, liquids, and gases
    b outer space
    c only gases
    solids, liquids, and gases
  9. Seismic waves travel ______

    a from north to south
    b toward the equator
    c outward in all direction from their point of origin
    outward in all directions from their point of origin
  10. When seismic waves from an earthquake travel Earth ____

    a buildings shake and crumble
    b the ground trembles
    c both of the above
    both of the above
  11. How do tsunamis begin?

    a at the bottom of the ocean
    b when a volcano erupts under water
    c both of the above
    both of the above
  12. Which of the following is a renewable resource?

    a gasoline
    b oil
    c sunlight
  13. Any change to the environment that has a negative effect on Earth's geosphere, hydrosphere, or atmosphere is ____

    a renewable
    b extinction
    c pollution
  14. If all members of a species disapper from Earth, the species is called _____

    a extinct
    b keystone
    c endangered
  15. All of the following threaten or endanger species EXCEPT _________

    a gene pool diversity
    b pollution
    c deforestation
    gene pool diversity
  16. The loss of a natural habitat is called ____________

    a habitat fragmentation
    b poaching
    c habitat destruction
    habitat destruction
  17. Two of the following human activitites negatively affect habitats and survival of organisms EXCEPT ______

    a surface mining
    b construction and urban development
    c restoring natural areas
    restoring natural areas
  18. Three human activities that may harm land and soil are ______

    a development, crop rotation, and land reclamation
    b mining, erosion, and crop rotation
    c agriculture, development, and mining
    agriculture, development, and mining
  19. Mining, logging, and farming can expose the soil and may lead to _______

    a development
    b erosion
    c crop rotation
  20. What is it called when there is a loss of so much topsoil that plants can no longer grow in the soil?

    a erosion
    b desertification
    c nutrient depletion
  21. Putting solid waste in open dumps is dangerous when rain dissolves chemicals from the waste. This polluted water is called _______

    a compost
    b biodegradable
    c leachate
  22. Any change to the atmosphere that has harmful effects is called _________

    a global warning
    b acid rain
    c air pollution
    air pollution
  23. Acid rain is _______

    a harming organisms
    b harming the ozone layer
    c causing global warming
    harming organisms
  24. Most water pollution is caused by ________

    a volcanic eruptions
    b human activities
    c drought
    human activities
  25. Which is the LEAST likely to be a source of water pollution?

    a pesticides
    b mining
    c rain

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