What are the three kinds of borders?

Why falling head test is not suitable for coarse grained soil such as gravel? In a sample of pure copper all atoms have the same what? Why law of conservation of mass should better be called as law of conservation of mass and energy? What happens to plates at a transform plate boundary? Which continets are in the Northern Hemisphere? What is the molar mass of NaBr? Why do farmers add limestone to soil? Is rocky soil good for farming? The proportions of the reactants and products involved in a chemical reaction are shown by the what in the balanced equation describing the reaction? What is the carrying away of top soil? Why does it rain in the rainforest but not in the desert? The soil in tropical climates is often what? How much money does a volcanologist earn? Can you take Valtrex if you are allergic to sulfur and codeine? Tension can cause the formation of fault-block mountains or? What type of weather the tropics experience? How do turn sand into fertile soil? Antimony chromate formula? Why do crumbs fall down to the ground on earth and not in space? What ring of phenyl benzoate would undergo nitration more easily?

What are the three kinds of borders?