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Practice Reading: Fill in The Blanks (Drag & Drop) ID: #39476 A consequence
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The    perfect    conditions    for    fossil    creation    are    usually    found    in    lakes    and    seas,    as    the    remains    have    to    be    surrounded    by    water.    This    explains    why    fossils    of    marine    species    are        more    common    than    terrestrial    ones.    For    fossils    to    form,    the    dead    organism    must    be    buried    quite    quickly,    for    example    in    mud    or    sand.    This    is    because      to    oxygen    leads    to    rapid    and    complete    decay,    making    fossil    formation    an    .    Over    an    long    period    of    time,    the    layer    of    mud    or    sand    that's    covering    the    dead    organism    becomes    thicker.    A    consequence    of    this    is    that    the    deepest    levels    eventually    come    under    such    that    they    gradually    turn    into    rock.    Meanwhile,    minerals    from    the    water    seep    into    the    organism's    tissues,    causing    them    to    harden.    This    creates    a    solid    outline    of    the    organism    encased    in    rock    -    a    fossil.    

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