Verified Answer :

brendahh95

1) gravity, which drives the flow downslope
2) drag at the base of the flow
3) resistance caused by viscosity of the flow,
both of which tend to slow the progress of the flow.

christopherprufer

1) gravity, which drives the flow downslope
2) drag at the base of the flow
3) resistance caused by viscosity of the flow, 

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