science chapter 3.txt

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melissarenee
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186141
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science chapter 3.txt
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2012-11-29 18:15:36
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6th grade science chapter
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6th grade science chapter 3
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  1. the study of the earth and its structure?
    geology
  2. scientisits who study the structure of the earth?
    geolgist
  3. the outer layer of the earth?
    crust
  4. the boundary between the crust and the mantle?
    moho
  5. the innermost region of the earth?
    core
  6. a mixture of broken down rocks and decomposed plants and animals?
    soil
  7. the process by which new soil is formed?
    weathering
  8. type of weathering caused by ice, flowing water, or windblown sand?
    phisical weathering
  9. underwater mountain ranges where plates of the earth's crust are thought to be moving away from each other?
    mid ocean ridges
  10. Describe the earth's mantle.
    the middle layer of the 1800 miles thick
  11. Which part of the earth's core is a solid?
    inner core
  12. which part of the earths's core is a liquid?
    outer core
  13. explain the difference between chemical and physical weathering.
    chemical is caused mostly by ground but phisical is caused manly by weather
  14. Giant waves that may be caused by earthquakes
    Tsunamis
  15. any trembling or shaking of the earth's crust
    Earthquake
  16. Scientists who study earthquakes
    Seismologists
  17. The break that appears at the boundary between two moving gasses of rock
    Fault
  18. The point under the ground where an earthquake begins
    Focus
  19. The strength of an earthquake
    Magnitude
  20. the regions of the earth's crust where most earthquake faults are found
    Seismic belts
  21. most earthquakes occur in this region
    Circum pacific belt
  22. explain
  23. how can the motions of the earth's plates cause earthquakes?
    the plates rub together
  24. name given to melted rocks while it is still underground?
    magma
  25. a reservoir of magma a few miles beneath the surface that may give rise to a volcano?
    Magma chamber
  26. a vent that allows molten rocks and hot gasses to escape from within the earth?
    vent
  27. name gave to melted rocks that has reached the earth�s surface?
    lava
  28. the belt of volcanoes that encircles the pacific ocean?
    ring of fire
  29. holes or cracks serving as escape vents for underground gasses?
    volcano
  30. volcanic ash lapilli and volcanic bombs are examples of these rocks fragments?
    tephra
  31. dome shaped volcanoes formed by eruptions of fluid runny lava?
    shield volcano
  32. a depression at the top of a volcano?
    crater
  33. Relatively small cone shaped volcanoes formed mostly of tephra and quickly eroded?
    cinder cone volcano
  34. steep sided volcanoes formed by alternating layers of fluid lava and tephra?
    composite volcanoes
  35. a large bowl shaped depression formed when an underground magma chamber caves in?
    crater lake
  36. what is the difference between a dormant volcano and an extinct volcano?
    a dormant volcano could erupt also known as "sleeping" but the extinct volcano is gone for ever
  37. describe each of following kind of eruptions: Hawaiian strombolian plinian?
    Hawaiian produces a large amount of fluid lava that surges from the volcanoes vent like water from a fountain a strombolian are named after a very active volcano in italy called the mount stromboli a palinial comes from volcanoes that have lain dormant for a long period of time

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