The earth's atmosphere is composed of 78% nitrogen, 21% oxygen, 0.9% argon, and 0.1% traces of other gases. If the total pressure right now is 101.3 kPa, what is the partial pressure of argon?

What diagram shows the ionic compound of magnesium oxide

Which three statements represent the benefits of performing experiments using computer simulations?

What causes different colors to appear in the sky? the absorption of light by air molecules the reflection of light by bodies of water the greenhouse effect in earth's atmosphere the scattering and reflection of light by dust particles