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  1. Whole-Earth structure

    In the 1960s, it was discovered that the Earth's lithosphere, which includes the crust and rigid uppermost portion of the upper mantle, is separated into tectonic plates that move across the plastically deforming, solid, upper mant… See more

    Geological time

    The geological time scale encompasses the history of the Earth. It is bracketed at the earliest by the dates of the first Solar System material at 4.567 Ga (or 4.567 billion years ago) and the formation of the Earth at 4.54 Ga (4.… See more

    Dating methods

    Methods for relative dating were developed when geology first emerged as a natural science. Geologists still use the following principles today as a means to provide information about geological history and the timing of ge… See more

    Geological development of an area

    The geology of an area changes through time as rock units are deposited and inserted, and deformational processes alter their shapes and locations.
    Rock units are first emplaced either by deposition … See more

    Investigative methods

    Geologists use a number of fields, laboratory, and numerical modeling methods to decipher Earth history and to understand the processes that occur on and inside the Earth. In typical geological investigatio… See more

    Planetary geology

    With the advent of space exploration in the twentieth century, geologists have begun to look at other planetary bodies in the same ways that have been developed to study the Earth. This new field of study is called planetary g… See more

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