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15.4: Understanding Earth's History- Challenge 1

  • Page ID
    5578
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    1. Why are the La Brea Tar Pits in Los Angeles, California, an exception?
    they formed under unusual circumstances
    2. Hard-shelled marine organisms ___ more often than organisms with soft tissues in exposed environments.
    fossilize
    3. Amber is ___.
    fossilized tree sap
    4. When insects fossilize, it is usually in ___.
    amber
    5. A bone dissolves and leaves behind a space in a rock called a ___, which fills with minerals to form a ___in the original shape of the organism.
    mold; cast
    6. ___ can be used to identify a specific period of time.
    Index fossils
    7. At the time of the fossilization of coal, the temperature of Antarctica was ___.
    warm
    8. Compared with fossils in younger rocks, fossils in older rocks are ___.
    less similar to modern organisms

    15.4: Understanding Earth's History- Challenge 1 is shared under a CK-12 license and was authored, remixed, and/or curated by CK-12 Foundation via source content that was edited to conform to the style and standards of the LibreTexts platform; a detailed edit history is available upon request.

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