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Mountains Compare types of mountains.
Essential Questions: Compare types of mountains. Identify the forces that shape Earth’s mountains.
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Mountains There are four main types of mountains: fault-block, folded, upwarped, and volcanic. Each type forms in a different way and can produce mountains that vary greatly in size.
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Mountains The ruggedness of a mountain chain depends largely on whether or not it is still forming. Stopped forming Still forming
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Mountains Infer what determines how rugged and high a mountain chain is. Whether or not it is still forming.
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Mountains Define fault-block mountains.
Sharp, jagged mountains made of huge, tilted blocks of rock that are separated from surrounding rock by faults and form because of pulling forces Define fault-block mountains. Sierra Nevada in California
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Mountains Rock layers get pulled in opposite directions, large blocks slide downward, creating valleys and peaks. Describe how fault-block mountains form.
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Mountains Define folded mountains.
Mountains that form by the folding of rock layers caused by compressive forces Define folded mountains. Appalachian in Maryland
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Mountains Compression: two plates are pushed together, this causes rock layers to buckle and fold Describe how folded mountains form.
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Mountains Define upwarped mountains.
Mountains that form when forces inside Earth push up on the crust Define upwarped mountains. Rocky Mountains in Colorado
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Mountains Forces inside Earth push up the crust; with time sedimentary rock layers erode exposing igneous and metamorphic rock Describe how upwarped mountains form.
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Mountains Define volcanic mountains.
Mountains that form when magma is forced upward and flows onto Earth’s surface Define volcanic mountains. Mt St Helens in Washington
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Mountains Magma from inside the Earth, called lava after it reaches Earth’s surface, cools. Over time, layer upon layer of lava piles up creating a cone shaped feature. Describe how volcanic mountains form.
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Uplift If you were to place wooden blocks of various thickness in a container of water you would notice that different blocks of wood would float at different heights. The thicker wood would float higher in the water than the thinner blocks would.
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Uplift With the blocks, the buoyant force of water is balancing the force of gravity. A similar process called ISOSTASY occurs in Earth. Principle stating that Earth’s lithosphere floats on a plasticlike upper part of the mantle called the asthenosphere Define isostasy
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Uplift The principle of isostasy is why the crust under mountains is thicker than it is elsewhere. Isostasy also the floating of icebergs.
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Mountains Pictures
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Mountains Pictures
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