Ablock with a volume of 12cm has a density of 3cm. the block is cut into two pieces. one piece has a volume of 8cm, and the other piece has a volume of 4 cm. what are the densities of the two?

Density does not change when you divide the cube, due to the principle of mass conservation. The density given in this case by 3 , will remain the same.

The only way for it to change, will be if you compressed the block, so now the same mass will be compressed in less volume, or you add heat to the system.

Explanation:

blue light is scattered in different directions by the tiny molecules of air. blue is scattered more than other colours because it has a shorter distance to travel which results in smaller waves. this is why we see a blue sky most of the time.