Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
The Sierra Nevada moved up along one side of the fault. Approximate location of fault The land on the other side of the fault dropped down. The Sierra Nevada in California is a fault-block mountain range. The range moved up along a normal fault along its eastern edge. The block on the other side of the fault dropped down. This combination of upward and downward movement formed the steep eastern side of the Sierra Nevada. The western side of the range tilts down gently toward California’s Central Valley. In summary, both folded mountains and fault-block mountains form over millions of years. Folded mountains are pushed up by slow, continual stress that causes rock to gradually bend. Fault-block mountains form, earthquake by earthquake, as stress built up in the crust is released by the movement of rock. Folded mountains form where continental crust is being compressed, and fault-block mountains form where it is being stretched. CRITICAL THINKING 1. How is the formation of mountain belts related to tectonic plate boundaries? 4. Analyze The Ural Mountain belt is no longer along the edge of a tectonic plate. Would you expect the Urals to be tall and steep or low and rounded? Why? 2. How do folded mountains form? 3. How do fault-block mountains form? 5. Synthesize How could it be possible for a mountain range to be continually pushed up but not get any higher? CHALLENGE 6. Analyze This graph shows how the heights of two mountains changed as they formed. Which line shows the formation of a folded mountain? a fault-block mountain? Explain. Height KEY CONCEPTS Time 260 Unit 2: The Changing Earth