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June 9, 2006, Newsletter Issue #94: Geomorphology and Time
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Tip of the Week
Many people look at landforms and wonder how they were produced. The short answer is, the same way they are being produced now.
The same physical processes and laws that operate today have operated throughout geologic time - that is, you can safely assume that rivers eroded their banks and deposited sandbars; storms washed away beaches; and mountains were lifted up and worn away since the beginning of their existence.
What has changed, however, could easily be the environment. Glaciers once extended much farther south than they do today, and seas have at times been much farther inland. The relationship of the continents to the equator has also changed; so while processes like erosion havenīt changed, locations and climates have.
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