When two or more elements join together what do they create?

What does stormy mean on the barometer? What kind of precipitaion pattern helps govern the climate of the Swahili coast? Which term is used to deacribe objects that produce light? How does the under canopy layer adapt in the rain forest? What are three important elements that the tooth bud contain? How many cubic meters of reinforced concrete are there on an average house? Does oxygen have the least stored chemical energy? What products are made out of barium? How calculate kvar if p is 560 kw and kva is 700? What city is 90 degrees south latitude and 0 degrees longitude? The flap that covers the nasal tract is called what? Why some of the appliances perform quite unsatisfactory when long extension cords are used? Does vesuvius do the most damage in the world? Which small rocky planets have no rings? How do molecules pass through the visking tube? A coronal plane through the head passes through what body parts? What types of air advances at a warm front? Where is ova produced? What is the difference between a rift valley and a mid ocean ridge and what kinds of boundaries do they form at? When was the chemical weapons convention signed by the United States?