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the view that most of earth's geological features are the result of large-scale catastrophes such as floods, volcanic eruptions, etc.
the view that most of earth's geological features are the result of slow, gradual processes that have been at work for millions or even billions of years.
rock formed from sediments (sand, silt, and other components of soil) and laid down by water or some other agent.
when there are parallel, stratified rock layers above and below the unconformity, but there is a clear surface of erosion between them
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