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Other

Description:

The Earth is very old -- 4.5 billion years or more -- according to recent estimates. This vast span of time, called geologic time by earth scientists, is difficult to comprehend in the familiar time units of months and years, or even centuries. How then do scientists reckon geologic time, and why do they believe the Earth is so old? A great part of the secret of the Earth's age is locked up in its rocks, and our centuries-old search for the key led to the beginning and nourished the growth of geologic science.

Subjects:

    Education Levels:

    • Grade 1
    • Grade 2
    • Grade 3
    • Grade 4
    • Grade 5
    • Grade 6
    • Grade 7
    • Grade 8
    • Grade 9
    • Grade 10
    • Grade 11
    • Grade 12

    Keywords:

    Informal Education,Evolution,Middle School,fossils,NSDL,Upper Elementary,geology,oai:nsdl.org:2200/20120111184543439T,Earth system evolution,NSDL_SetSpec_ncs-NSDL-COLLECTION-000-003-112-012,Earth and space science,Grade 6,Rocks,Elementary School,Space Science,Life Science,Earth materials,Geologic time,Geoscience,Grade 5

    Language:

    English

    Access Privileges:

    Public - Available to anyone

    License Deed:

    Creative Commons Attribution Non-Commercial Share Alike

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