Randomized Controlled Studies: This is a study in which 1) There are two groups, one treatment group and one control group. The treatment group receives the treatment under investigation, and the control group receives either no treatment (placebo) or standard treatment. 2) Patients are randomly assigned to all groups.
winds that blow in a steady direction can move a dune. such wind will consistently pick up sand from one side and deposit it to a other side. this causes the entire dune to s â¦ lowly move in the direction if the wind.
Wind carried sediment falls to the ground when the wind slows down. Deposits formed by wind erosion and deposition include sand dunes and loess deposits. Sand dunes have coarse grained sediments, loess has finer sediments, both are caused by wind erosion.