Jet streams are bands of strong wind that generally blow from west to east all across the globe. They impact weather, air travel and many other things that take place in our atmosphere.
The answer is A. Appalachian Mountains
When American colonists headed west they crossed what will known today as the Appalachian Mountains.
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Each era is subdivided into a number of periods. The periods of the Cenozoic, the present era, are further divided into epochs. Many divisions of the geologic time scale are based on events in Earth's geologic history. Some divisions are based entirely on the fossil record.
Between Austin, Texas and Dallas, Texas it’s 195 miles via I-35 E and I-35 S.