Apebble sinks in the water. a twig floats on top of the water. compare the densities of the water , the pebble and the twig.

water is used to store them because it would keep the radiation from getting out in the open and causing harm to the workers

smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.