streams come down out of steep areas onto much flatter land, lose velocity, and drop material in triangular-shaped structures called

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.

measured, submerged.