What is the mouth of a spring called?

How many rivers in Central America? How does grass survive in the forest? Are dugongs in the Great Barrier Reef? How many tributaries does the Parana river have? Does the st lawrence river flow into Lake Ontario? What is the Australian term for vast desert areas in the interior of the mainland? Who dropped weigts from the top of a tower to prove that ghravity affects everything equally? How much weight can the tsing ma bridge hold? Which development most aided explorers in their ability to sail the oceans to discover the New World during the Age of Discovery? Is the everglades a natural wonder? What are areas of broken fast-flowing water in a river? Who was the first to row across the Atlantic? Four major tourist sites in South Carolina? What is there to do in Annapolis Maryland? What is the water temperature of an estuary? How much did it cost to build Burj Khalifa? Which of these bodies of water does not border the Arabian peninsula Persian gulf Arabian sea red sea Mediterranean sea? What boy's name is also the name of an African country and lake? How far from London to stamford bridge? When did they finish building the chyslar building?