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By. BB
In 1890 Yosemite became a national park.
They recognized Yosemite as a national park
because of its history, high cliffs and waterfalls.
Its beautiful views take people away when they
visit.
The geology of the Yosemite area is characterized by
granitic rocks and remnants of older rock. About 10
million years ago, the Sierra Nevada was uplifted and
then tilted to form its relatively gentle western slopes
and the more dramatic eastern slopes. The uplift
increased the steepness of stream and river beds,
resulting in formation of deep, narrow canyons. About
1 million years ago, snow and ice accumulated,
forming glaciers at the higher alpine meadows that
moved down the river valleys. Ice thickness in
Yosemite Valley may have reached 4,000 feet (1,200 m)
during the early glacial episode. The down slope
movement of the ice masses cut and sculpted the Ushaped. The valley that attracts so many visitors to its
scenic vistas today.
The rocks of Yosemite are plutonic rocks. Plutonic
rocks form deep underground when molten
rock cools and solidifies very slowly, allowing
large crystals to form. In contrast, volcanic
igneous rocks form at the surface when molten
rock cools and solidifies quickly, resulting in
small crystals. Granite, granodiorite, tonalite,
quartz monzonite, and quartz monzodiorite are
rocks that are found there.
The whole valley ranges from 3,000 feet below to
13,000 feet over in elevation. It has U-shaped
canyons, jagged peaks, rounded domes,
waterfalls and moraines. These are all
outcomes of glaciations.
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Smoking when you get there.
Leaving trash when you leave.
Polluting the air.
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The park covers an area of 761,268 acres (3,080.74 km2) and reaches across
the western slopes of the Sierra Nevada mountain chain.
Over 3.7 million people visit Yosemite each year: most spend their time in
the seven square miles (18 km2) of Yosemite Valley Designated a World
Heritage Site in 1984.
Its scenery gets a lot of people in the summer when its hot and perfect to
hike!