The Appalachian Mountains (i/plen/ or /pltn/,[note 1] French: les Appalaches), often called the Appalachians, are a system of mountains in eastern North America. The Appalachians first formed roughly 480 million years ago during the Ordovician Period and once reached elevations similar to those of the Alps and the Rocky Mountains before they were eroded. The Appalachian chain is a barrier to east-west travel as it forms a series of alternating ridgelines and valleys oriented in opposition to any road running east-west.

Definitions vary on the precise boundaries of the Appalachians. The United States Geological Survey (USGS) defines the Appalachian Highlands physiographic division as consisting of thirteen provinces: the Atlantic Coast Uplands, Eastern Newfoundland Atlantic, Maritime Acadian Highlands, Maritime Plain, Notre Dame and Megantic Mountains, Western Newfoundland Mountains, Piedmont, Blue Ridge, Valley and Ridge, Saint Lawrence Valley, Appalachian Plateaus, New England province, and the Adirondack provinces. A common variant definition does not include the Adirondack Mountains, which geologically belong to the Grenville Orogeny and have a different geological history from the rest of the Appalachians.

1. Where are the Appalachains?
2. How many pronvices are there?
3. Is New York one of them?
4. Which province is sometimes left out?
5. What does it belong to geologically?
6. Is Blue Ridge a province?
7. What is a mountain chain with a similar elevation?
8. And another?
9. When did the Appalachians form?
10. Did the form during the Jurassic period?
11. Which period did they form?
12. Which continent are they in?
13. Do they go north-south or east-west?
14. What is the french name for the mountains?
15. Where the mountains eroded?
16. What US agency named the division?
17. Do definitions vary?
18. What is an example of a division?

Provide a numbered list of answers.
1. Eastern North America
2. thirteen
3. No
4. Adirondack Mountains,
5. The Grenville Orogeny.
6. Yes.
7. The Alps
8. The Rocky Mountains.
9. 480 million years ago.
10. No.
11. The Ordovician Period.
12. North America.
13. North-South
14. Les Appalaches.
15. Yes.
16. The United States Geological Survey.
17. Yes.
18. the Grenville Orogeny