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    Skill 1: Understanding vocabulary from context




    The Moho



    The dividing line between the Earth’s mantle and crust is called the Moho,which is short for Mohorovicic discontinuity and is named after the scientist who discovered it. The mantle is the region of the Earth that extends from the outer edge of core almost to the surface; it is 2,900 kilometers thick and encompasses about 84 percent of the total volume of the Earth. The crust the other hand, is the thin outer layer of the Earth. The term Moho is used to indicate where the mantle ends and the crust begins.
    Using the reflection of seismic waves at thousands of different locations, scientists have been able to draw some interesting conclusion about the Moho. First of all, the crust is very thin, averaging only about 15 to 20 kilometers in thickness, compared with tens of thousands of kilometers in width; In addition, the Moho varies to a considerable degree in depth and is deepest below the highest mountain ranges and shallower below regions with lower surface elevations. The Moho reaches depth of about 70 kilometers beneath massive mountain ranges, approximately 40 kilometers beneath average continental regions, and only 6 kilometer beneath the ocean floor.



    1- The word encompass in paragraphs 1 is closest in meaning to :

    a. contains
    b. searches
    c. encircles
    d. directs

    This question asks about the meaning of the word encompasses. In this question, you are not expected to know the meaning of this word. Instead, you should see in the context that the mantle … is 2,900 kilometers thick and encompasses about 84 percent of total volume of the Earth. From this context, you can determine that encompass is closet in meaning to contains.


    2. The word draw in paragraph 2 could best be replaced by :

    a. sketch
    b. pull
    c. draft
    d. make

    in this question, you are asked to choose a word that could replace draw. You should understand that draw is a normal, everyday word that is not being used in its normal, everyday way. To answer this type of question, you must see which answer best fits into the context in the passage .it does not make sense to talk about being able to sketch, pull, or some interesting conclusions, but it does make sense to make some interesting conclusion.


    How to answer the question?

    1- Find the word or phrase in the passage.
    2- Read the sentence that contains the word or phrase carefully.
    3- Look for context clues to help you understand the meaning.
    4- Chose the answer that the context indicates.



    to be continued
    ویرایش توسط niloofarabi : 2016_06_06 در ساعت 16:49
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