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Practice Reading: Fill in the Blanks (Dropdown) ID: #44176 Sinkholes 2
Instructions
Sinkholes    are    holes    in    the    ground    of    width    and    depth.    The    widest,    measuring    80    kilometeres,    is    the    Qattara    depression    in    Egypt;    the    deepest    one    is    in    china    descending    662    metres.    Sinkholes    occur    in    areas    where    the    underlying    rock    water    containing    a    high    concentration    of    acid.    Water    becomes    acidic    carbon    dioxide    from    soil    and    dead    plants.    This    water    creates    a    cavity    or    hole    in    the    rock    which    gets    bigger    over    time.    The    earth    covering    the    cavity    into    the    hole    beneath    when    it    can    no    longer    support    own    weight,    and    in    some    cases,    the    weight    of    building    and    roads    that    have    been    constructed    on    top    of    it.  

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