Beige underwater photography

(1) Salt water seed selection is actually based on the relationship between the density of salt water and the density of rice, using the ups and downs of objects to select full seeds;

That is, the density of full rice is higher than that of salt water, and the seeds sink and sink to the bottom of the basin; Incomplete rice is less dense than salt water and floats and eventually floats on the surface of salt water.

(2)A, wind sorting full wheat grains, shriveled wheat grains and grass clippings, wherein the density of full wheat grains is greater than that of shriveled wheat grains and grass clippings;

B, plastic is used as the shell of the power socket, which has good insulation performance;

C, using rubber to make automobile tires has good rubber elasticity;

D, using plastic foam to make the "stone" falling in the performance scene is because the density of plastic foam is small and it is not easy to hurt the actors.

So the answer is: (1) density; (2) Millet with density greater than water sinks into the water, and millet with density less than water floats on the water; (3) AD.