No.
The Grand Canyon is a "gorge" or "canyon" if you wish. Hence the name Grand Canyon. However, there are two "plateau's" on either side of the canyon which could be considered part of the GC, from a certain point of view.
Yes it is. A plateau is a flat highland whereas a canyon is a deep ravine.
Appalachian Plateau
plateau
The colorado Plateau
1st of course would be the Colorado plateau. Where would the river flow if it came first before the plateau? 2nd would be the Colorado river. As time went by, the Colorado river continually eroded the plateau until it had carved out a deep canyon from the plateau. This would then be the start of the Grand Canyon.
About 75 millions years ago, the Grand Canyon area was a plateau (the Colorado Plateau) that was uplifted an estimated 2 miles (3.2 km) during the Laramide Orogeny.
Colorado Plateau.
The Colorado plateau
Grand Canyon, Black Mesa, Colorado Plateau
Canyon
Grand Canyon, Black Mesa, and the Colorado Plateau.