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.
What is a place where sand dunes are formed? Sand dunes can form in some areas of the desert, along the coast or near major bodies of water such as the Great Lakes. Some form in areas that were laid bare by the retre â¦ at of glaciers after the last ice age.