What salt is formed by the reaction of sodium hydroxide and nitric acid?

altitude, density, pressure

air gets less dense the higher the altitude and also the air pressure is less as altitude rises.

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.