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7th Grade Ch. 3 Sec. 2 Properties of Magma
 

7th Grade Ch. 3 Sec. 2 Properties of Magma

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    7th Grade Ch. 3 Sec. 2 Properties of Magma 7th Grade Ch. 3 Sec. 2 Properties of Magma Presentation Transcript

    • Ch. 3 Sec. 2 Properties of Magma
    • element
      • substance that cannot be broken down into other substances
      • ex: carbon, hydrogen
    • compound
      • substance made of 2 or more elements that have been chemically combined
      • ex: water, carbon dioxide
    • physical property
      • any characteristic of a substance that can be observed or measured w/out changing composition of substance
      • ex: freezing point
    • chemical property
      • property that produces change in composition of matter
      • ex: ability to burn
    • viscosity
      • physical property
      • resistance of liquid to flowing
      • greater viscosity-slower it flows
    • Question: How Fast do Liquids Flow?
      • Hypothesis: I predict that ____________
      • Procedure: See page 87
      fast-lower viscosity-low 53 sec Vegetable Oil Slow-greater viscosity-high 98 sec Honey Flowed-Fast or slow/ Viscosity Time Liquid
    • low viscosity high viscosity
    • low viscosity high viscosity
    • low viscosity high viscosity
    • viscosity of magma
      • depends on silica content & temp.
      • silica = oxygen + silicon
      • more silica  higher viscosity
    • pahoehoe
      • fast-moving, hot lava
      • low viscosity
      • looks like solid mass of wrinkles, billows & ropelike coils
      http://www.youtube.com/watch?v=0jry-iMXjik
    • aa aa surge
      • cooler & slower than pahoehoe
      • hardens into rough chunks
      http://www.youtube.com/watch?v=iyIV5fd1Aww
    •  
    • How are pahoehoe and aa different?
    • The viscosity of magma depends on what two factors?
      • silica content
      • temperature
    • compound
      • substance made of 2 or more elements that have been chemically combined
    • element
      • substance that cannot be broken down into other substances
    • chemical property or physical property?
      • ability to burn
      chemical property
    • low viscosity high viscosity
    • low viscosity high viscosity
    • low viscosity high viscosity