They are said to be “denser” than air. what happens is that light slows down when it passes from the less dense air into the denser glass of water. this slowing down the ray of light also causes the ray of light to change directions. it is the change in the speed of the light that causes refraction.
The answer is round bones...round bones are stronger, flat bones are often thin and curved, meanwhile, round bones are thicker and stronger.
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Answer:
Thick layer of body fat or bubbler, to reduce body heat loss. Strong hooves for walking on rock slopes. Thick fur on paws for protection from cold while walking on snow.
Answer:
Coal, Plastics, and Radioactive Materials.