The Appalachian Mountains (i/ˌæpəˈleɪʃᵻn/ or /ˌæpəˈlætʃᵻn/,[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 Mégantic 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.
Where are the Appalachains?
How many pronvices are there?
Is New York one of them?
Which province is sometimes left out?
What does it belong to geologically?
Is Blue Ridge a province?
What is a mountain chain with a similar elevation?
And another?
When did the Appalachians form?
Did the form during the Jurassic period?
Which period did they form?
Which continent are they in?
Do they go north-south or east-west?
What is the french name for the mountains?
Where the mountains eroded?
What US agency named the division?
Do definitions vary?
What is an example of a division?
Eastern North America
The Appalachian Mountains (i/ˌæpəˈleɪʃᵻn/ or /ˌæpəˈlætʃᵻn/,[note 1] French: les Appalaches), often called the Appalachians, are a system of mountains in eastern North America
thirteen
 defines the Appalachian Highlands physiographic division as consisting of thirteen provinces: 
No
 of thirteen provinces: the Atlantic Coast Uplands, Eastern Newfoundland Atlantic, Maritime Acadian Highlands, Maritime Plain, Notre Dame and Mégantic Mountains, Western Newfoundland Mountains, Piedmont, Blue Ridge, Valley and Ridge, Saint Lawrence Valley, Appalachian Plateaus, New England province, and the Adirondack provinces.
Adirondack Mountains,
A common variant definition does not include the Adirondack Mountains,
The Grenville Orogeny.
Adirondack Mountains, which geologically belong to the Grenville Orogeny 
Yes.
 thirteen provinces: the Atlantic Coast Uplands, Eastern Newfoundland Atlantic, Maritime Acadian Highlands, Maritime Plain, Notre Dame and Mégantic Mountains, Western Newfoundland Mountains, Piedmont, Blue Ridge, 
The Alps
The Appalachians first formed roughly 480 million years ago during the Ordovician Period and once reached elevations similar to those of the Alps 
The Rocky Mountains.
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
480 million years ago.
The Appalachians first formed roughly 480 million years ago
No.
The Appalachians first formed roughly 480 million years ago during the Ordovician Period 
The Ordovician Period.
The Appalachians first formed roughly 480 million years ago during the Ordovician Period 
North America.
often called the Appalachians, are a system of mountains in eastern North America.
North-South
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. 

Les Appalaches.
The Appalachian Mountains (i/ˌæpəˈleɪʃᵻn/ or /ˌæpəˈlætʃᵻn/,[note 1] French: les Appalaches),
Yes.
once reached elevations similar to those of the Alps and the Rocky Mountains before they were eroded. 
The United States Geological Survey.
Definitions vary on the precise boundaries of the Appalachians. The United States Geological Survey (USGS) defines the Appalachian Highlands physiographic division 
Yes.
 A common variant definition does not include the Adirondack Mountains,
the Grenville Orogeny
 A common variant definition does not include the Adirondack Mountains, which geologically belong to the Grenville Orogeny