Sample equal to the atomic mass of an element in grams contains atoms. This amount of matter is called .

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.

so she was walking and she stepped on warm jeffy , uh uh uhh dadye i just pooped my pants