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.
When wave and wind conditions are favorable, this longshore current is capable of moving sand along the sea bottom in a direction parallel to shore. an ocean current caused by the approach of waves to a coast at an angle. the widening and building shoreward of a beach ...