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Alright this is unit 2 lesson 11 mountain building. How did mountain I'm gonna start reading on page 3. How did mountain ranges and tectonic(?) plates relate to each other. How are mountains built. What forces are responsible for mountain building. Do mountains occur anywhere or only in specific places. Why do mountains occur in change of ranges. These questions went largely unanswered until geologist(?) began to look at the earth surface by way of the theory of plate tectonic(?). Nearly looking at a map of the world mountain ranges doesn't tell you much. But when you overlay the outlines of tectonic(?) plate it becomes obvious that most mountain ranges are located at the boundaries of continental and oceanic(?) plates. Page 4 tectonic(?) forces form mountains by folding and volting(?). Tectonic(?) forces cause crystal rock to fold. In a fold horizontal compression dense the rock layers like pushing inward on both sides in a folded towel.