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  • The shadow zone exists because


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  • The shadow zone is the area of the earth from angular distances of 104 to 140 degrees from a given earthquake that does not receive any direct P waves The shadow zone results from S waves being stopped entirely by the liquid core and P waves being bent (refracted) by the liquid core There are two types of Shadow zones: one for P waves and one for S waves P wave shadows between 104-140 degree, both sides; S wave shadow from 105 of one side to 105 of the other 

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    • 1. Which term best describes how the solar system formed?

    • Options
    • A. Electrically
    • B. Gradually
    • C. Chemically
    • D. Rapidly
    • Discuss
    • 2. The hot holding temperature for potentially hazardous foods must be

    • Options
    • A. not less than 60 deg
    • B. less than 60 deg
    • C. less than 5 deg
    • D. None of the above
    • Discuss
    • 3. What type of macromolecule is DNA?

    • Options
    • A. Proteins
    • B. Carbohydrates
    • C. Nucleic acids
    • D. All of the above
    • Discuss
    • 4. What gas makes up most of the atmosphere?

    • Options
    • A. Oxygen
    • B. Helium
    • C. Nitrogen
    • D. Carbondioxide
    • Discuss
    • 5. The term "simple carbohydrates" refers to

    • Options
    • A. polysaccharides
    • B. monosaccharides and disaccharides
    • C. starch and glycogen
    • D. dietary fiber
    • Discuss
    • 6. Which of the following is an air pollutant?

    • Options
    • A. Sulphur dioxide
    • B. Ozone
    • C. Water vapour
    • D. Nitric oxide
    • Discuss
    • 7. Which is a density independent factor in controlling a population?

    • Options
    • A. Food shortage
    • B. Disease
    • C. Floods
    • D. All of the above
    • Discuss
    • 8. What structure separates the thoracic cavity from the abdominal cavity?

    • Options
    • A. Diaphragm
    • B. Liver
    • C. Lungs
    • D. Heart
    • Discuss
    • 9. For purifying drinking water alum is used

    • Options
    • A. TRUE
    • B. FALSE
    • Discuss
    • 10. Alcohol has many sensations and effects like

    • Options
    • A. loss of concentration
    • B. dizziness
    • C. nausea
    • D. All of the above
    • Discuss


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