Fluvial Erosion
No plants existed during the Precambrian. The formation of coal beds relied on vegetation.
by erosion eroding the banks and beds of a river
The Huang River constantly threatens to flood because of the buildup of silt in its river beds. Silt deposits make the bed of the river higher causing flooding.
Not necessarily.
Mercury =)
lunar
River beds
Mars
Mercury =)
Diamonds don't 'form' in river beds or in the sea bed where some are found. Diamonds are propelled into river beds and to the sea by water that flows over the kimberlite pipe where the diamonds are formed.Diamonds found in water are generally referred to as alluvial stones, meaning deposited in the water over a long period.
along river beds, rocks, etc :)
it gets deaper