Sand dunes and sand waves are both deposited in the same environment. true/false

FALSE

Explanation:

Sand dunes are depositional feature that is formed as a result of the accumulation of a large number of sand particles by the wind. This generally takes place in the region where there is abundant sand, mostly in the desert areas and near the coastal region.

On the other hand, sand waves are the sedimentary structures that are formed at the lower flow regime condition, due to the motion of water over the surface of the areas that contain abundant sand particles. They form both at the surface as well as underwater at various depths.

Thus, these two sedimentary structures are similar in appearance but they form by different agents. The sand dunes are formed in the aeolian environment whereas the sand waves are formed in the fluvial and marine environment.

Hence, the above statement is false.

-be a crystalline solid

- be soluble in water

-conduct electricity

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the answer for sodium is 0.186

the answer for rubidium is 0.251