Denser than water.
Is aok Densor than poplar
Yes red is darker than green.
Because green is better than red
Depends entirely upto you to which colour you prefer. I like red.
No, red light is lower frequency than green light.
Bromine is denser than air.
Yes. Obsidian is denser than water.
Stainless steel is heavier then aluminium.
Lots of things are denser than air. Mercury for example.
Yes, red has a lower frequency than green. It therefore has a longer wavelength.
Yes. Cold air is denser than warm air and thus the troposphere is denser in the winter than in the summer.