Muhammad did anexperiment, recording the changes in temperature in sand and water when exposed to a light source, and then when the light source was removed. Muhammad decides that
O A. sand and water conduct heat the same.
B. neither sand nor water conducts any heat.
C. water conducts heat better than sand.
D. sand conducts heat better than water.

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

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