How many provinces share southern border with US?

What are explosions made off? Is banana angsana edible fruit? Where can find Seismic belts? What are organisms that feed on dead or decaying matter is called a? What are the advantages of intercropping? When did nightshirts change to pajamas? How can we effectively reduce waste by implementing a system that encourages the reuse of materials? What is the planets that have been discovered by Copernicus? Where do alluvial fans occur and why? What information are conveyed by a balanced chemical reaction why is it necessary to balanced a chemical equation? Why the main vein of a leaf has a double pipeline of a cells? Does Lemonade tastes sour because it is acidic? What do scientists believe explains the increased density of material deeper into the mantle? What kind of tide does the observer experience when he is passes through tide bulge? What type of rock is found at the top of a waterfall? What different colors of insects can be developed using artificial selection? Is big bang pegasis good? What is the rigid part of the plates that are made up of oceanic crust or continental crust and upper mantle? Why is it important to use reduced light bulb? What is the scientific name for the viperfish?