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.
Sandstorm by Maddie. Strong winds blowing over loose soil or sand is what causes sandstorms. Sandstorms can also be called dust storms. They are caused by convection currents. Sandstorms are able to move entire sand dunes and sometimes able to move entire roads. There are also similar sandstorms in Mars.A lot of the particles in a dust storm or sandstorm are between 0.08mm and 1mm which also means 0.0032 and 0.04 inches in size.andstorms are able to move entire sand dunes and sometimes able to move entire roads. There are also similar sandstorms in Mars. A lot of the particles in a dust storm or sandstorm are between 0.08mm and 1mm which also means 0.0032 and 0.04 inches in size.