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The Sierra Nevada mountains signified gold for many of the newcomers moving west.

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Why do desert areas exist in the southwestern US?

The Sierra Nevada Mountains form a boundary that prevents Pacific moisture from moving inland, causing a rain shadow desert area.


Is the Mojave Desert a result of plate tectonics?

Indirectly, yes. Both the Coastal Mountains and the Sierra Nevada Mountains were forced up by plate tectonics. These mountains block Pacific moisture from moving inland causing a rain shadow desert on the leeward side.


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PG & E, Pacific Gas and Electric Company, covers a 70,000 square mile area. Starting from Bakersfield moving upwards to Eureka, California. It stretches from the Pacific Ocean, eastwards to the Sierra Nevada mountains.


What do you call mountains formed by blocks of crust moving along a fault?

Fault-block mountains. These are created when rocks along a fault are uplifted and tilted, forming steep mountain ranges with prominent peaks and valleys. An example of such mountains is the Sierra Nevada in California.


Why do deserts exist in the southwest US?

The coastal mountain ranges and Sierra Nevada act as barriers that keep Pacific moisture from moving inland, forming rain shadow deserts.


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Mountains formed by blocks of crust moving along a fault?

what are mountains formed by blocks of crust moving along a fault


Why sierra madre and Himalayas is fold mountains?

Because both ranges are the result of two geologic plates "crashing" at each other. In the case of the Himalayas, they are the result of the Indian subcontinent crashing into the Eurasian Plate, and for the Sierra Madre Occidental, they result from the Pacific Plate moving northwards with respect of the North American Plate.


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How did gold form in the sierra Nevada mountains?

The gold formed by fluid inclusion in a 130-mile-long belt in the foothills of the Sierra Nevada Mountains, and not in the Mountains themselves. Gold was probably initially concentrated from ocean water by volcanic vents in metamorphic rocks at the leading edge of the Smartville Block, a chunk of eastward-moving crust called an "island terrane", as it collided with the North American Plate about 165mya. During the period of collision, partial melting of this rock and saturation with water caused the gold and silica to dissolve in the water and flash into steam which made its way up through cracks and fissures. When the pressure and heat reduced, the gold and silica dropped out as veins of gold-laden quartz filling cracks in the country rock of the Plate. Many millions of years later, large chunks of dense rock broke off the bottom of the North American Plate and descended into the Mantle. This caused the Plate to be thinner and lighter, resulting in a large fracture and upwelling of Plate material, which is now the Sierra Nevada Mountains. Erosional processes in the last four million years washed some of the gold out of the quartz and into fossil river beds, which was the source of the 1849 Gold Rush gold. The gold-rich quartz veins were found when the placer golds were running out.


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