how long did it take for Kagan valley toform
It depends on how much rain falls and on how big the river is. It could take months
or even years
A long time.
it depends if it is man made or not
river valley is a river and a valley, like if a long stream of a river that is all i can say people.
Mississippi River
how long did it take for Kagan valley toform
7670 m
The merced river, which flows from sierra nevadas all the way to central valley, is about 145 miles long.
a valley
The Willamette Valley is Oregon's biggest valley. It is 187 miles long stretching from the Columbia River, just north of Portland, Oregon to the headwaters of the Willamette River south of Eugene, Oregon.
The Onyx River is an 18-mile long melt water stream that flows into Lake Vanda from a glacier at the end of the valley.
The Himalayas run West to East from the Indus river valley to the Brahmaputra river valley thereby forming an arc of 2,400 km long, the width varies from 400km in the west to 150km in the east
Mostly when a river flows through a flat area with soft soil.
i believe it takes 100 years to form a delta
rocks