Ch 7 Slow Changes on Earth Flashcards
What processes change rock into the sand?
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How do rivers and ocean waves change the shape of land?
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How do Ice and wind change Earth’s surface?
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bay
a body of water that is partly enclosed by land with a wide opening to the ocean. The opening, called the mouth, connects the bay to the ocean.
delta
a large mass of sediment deposited at the mouth of a river
deposition
dropping of sediment moved by water, wind and ice.
erosion
movement of rock material from one place to another
erratic
a single large boulder moved by a glacier and deposited when the glacier melts
glacier
a large mass of slow moving ice
headland
is a point of land, usually high, that extends out into the water, usually surrounded by water on three sides
moraine
the long ridge formed by the boulders , rocks and soil carried and deposited by a glacier
river system
The largest river and all the waterways that drain into it are called a river system.
sand dune
a hill or pile of sand formed by the wind
weathering
slow wearing away of rock into smaller pieces
causes of weathering
ice, plant roots, moving water, and chemicals
How do weathering and erosion form a deep canyon?
The water of a fast moving river breaks down rock. Over many years, the running water carries enough weathered material away to form a deep canyon.
What happens when a river or stream slows down?
As the river slows, the sediment drops out of the water.
What effect does the Shasta Dam have on the people of California?
The Shasta Dam controls the flood water of the Sacramento River, it also supplies irrigation water to farmers in California’s Central Valley. This has helped make agriculture very important supplying a quarter of all the food Americans eat.
How are moraine and erratic alike and different?
Erratic and moraine are formed by the movement of glaciers. They differ because an erratic is a large boulder and the moraine have several rocks formed into a ridge.
