Which of the following properties is considered the "true color" of a mineral? a) luster
b) shine
c) streak
d) radioactivity

C

Explanation:

i think cause i read about it long time ago

they float because they are less dense than the water itself

something denser than water, like a rock, will sink to the bottom

significant amounts of nitrogen oxides, carbon monoxide, and other pollution

explanation:

passenger vehicles are a major pollution contributor, producing significant amounts of nitrogen oxides, carbon monoxide, and other pollution. in 2013, transportation contributed more than half of the carbon monoxide and nitrogen oxides, and almost a quarter of the hydrocarbons emitted into our air.