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17 Cards in this Set
- Front
- Back
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What happens to water when it rains?
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Some water dries up, some sinks into the soil to become groundwater, and the rest runs down the land surface to become a part of a river.
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What do you call the place where a river begins?
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the source
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How do all rivers flow?
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All rivers flow from higher to lower ground.
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What do you call the deepest part of a river?
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A channel
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What is at the end of a river?
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a river's mouth
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What are the three main parts of a river?
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The source, the channel, and the mouth
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What is a tributary?
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a stream or river that flows into a larger stream or river
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What happens to river water?
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Most rivers flow to an ocean but sometimes flow into low ground such as a basin
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How does a river erode the land?
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Flowing water pulls rocks, sand and soil down the river. As they scrape along the bed and banks of the river, they carve an even deeper and wider path.
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What is erosion?
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the wearing away of the Earth's surface
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What is a floodplain?
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the low, flat land along a river
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What is a delta?
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A triangle-shaped land at a river's mouth which has been formed by silt from the river.
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How can rivers build up the land?
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When a river reaches flat land, its current slows and it drops the sand and soil it has been carrying. These deposits become sandbars or islands in the river. If it drops silt at the mouth, a delta is formed.
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What have people done to control flooding on rivers?
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People have built dams and levees.
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Levee
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a high wall made of earth built along the banks of a river to control flooding.
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Dam
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a wall built across a river to hold back water and protect against flooding
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How can rivers wear down and build up the land?
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Erosion pulls soil and rocks through the river bed making it deeper and wider.
The river can also carry silt and deposit it in areas to form islands, sandbars and deltas. |
