Question

Consider the following statements:

1. The extended depression on the ground through which a stream flows is called a river valley.

2. In Arizona (USA), the Grand Canyon of the Colorado River runs for 483 km and has a depth of 2.88 km.

Which of the statements given above is/ are correct?  

1. 1 only
2. 2 only
3. Both 1 and 2
4. Neither 1 nor 2 

Answer 1

Correct Answer - Option 3 : Both 1 and 2

The correct answer is Both 1 and 2

/hint -

• Valleys start as small and narrow rills; the rills will gradually develop into long and wide gullies; the gullies will further deepen, widen and lengthen to give rise to valleys. 

/imp

• A river valley is a valley that is typically V-shaped and is created by flowing water, called a fluvial valley or river valley. The exact shape will depend on the features of the stream that flows through it.
• The Grand Canyon, in Arizona, United States, is a steep-sided canyon carved by the Colorado River. The Grand Canyon has a length of 277 miles (446 km), a width of up to 18 miles (29 km), and a depth of over a mile.
• In the Colorado Plateau, the Grand Canyon is a river valley that reveals uplifted Proterozoic and Paleozoic strata and is also one of the Colorado Plateau province's six distinct physiographic areas.

/key

• Depending upon dimensions and shape, many types of valleys like V-shaped valley, gorge, canyon, etc. can be reorganized.
• Valley types depend upon the type and structure of rocks in which they form. 
• for example, canyons commonly from in horizontal bedded sedimentary rocks and gorges from in hard rocks.