Iron combines with oxygen to form rust. given the chemical reaction, how many grams of 4fe + 3o2 would produce 10 kg of rust? a.7kg b.10kg c.30kg d.70kg

Which part of earth’s surface receives the most direct rays from the sun? a) equator b) ocean c) poles d) mountains

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

+= + + balance the equation on coefficients, ex. 1,1,1