Weathering, Erosion, and Deposition Book F Lesson 1 Unit 1

What happens when a stream slows down?

• The stream picks up larger particles.

• The stream has more energy for erosion.

• The stream picks up more sediment.

• The stream deposits sediment

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The diagram shows the path of a river. Structure A is an oxbow lake, which was originally part of the river. This kind of lake can form when sediments build up and change the path of a river.

What are the two main processes that formed this river and lake?

• erosion and deposition

• erosion and chemical weathering

• deposition and physical weathering

• chemical weathering and physical weathering

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What is the process by which a delta forms?

• A stream cuts a new channel during a flood.

• A river overflows its banks and deposits sediment.

• As it enters the ocean, a river slows down and drops its sediment.

•      A stream leaves a steep mountain valley, enters a flatter plain, and drops its sediment.

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Which statement about deltas is true?

• Deltas are an example of stream erosion.

• Deltas are places where the soil is infertile

• Deltas are narrow, steep-walled, and
  V-shaped.

• Deltas are filled with nutrient-rich soil from deposition.

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Which statement best describes the process by which a stream forms a channel?

• The flow of water deposits soil and rock, creating a path for the stream.

• The flow of water erodes soil and rock, cutting a path for the stream.

• Part of a meandering stream is cut off during a flood.

• Gravity causes water to move downhill.

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When glaciers retreat, they leave behind huge blocks of ice and deposited sediments. When these ice blocks melt, they can form kettle lakes surrounded by the sediments. What would likely happen if sediment did not build up around the ice blocks?

• The water in the lake would dry up.

• Vegetation would not be able to grow

• The water would not stay contained.

•      Ice blocks would not be warmed enough to melt.

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Today scientists use a tool called seismic reflection to study the layers beneath the Mississippi River delta. This helps them understand the formation of the delta. They use their observations to reinforce their understanding of how deltas formed earlier in Earth’s history. What conclusion can the scientists draw?

• Deltas did not form in the past.

•                 In the past, deltas formed differently from the way they form today.

• Deltas formed throughout Earth’s history in the same way they form today.

• Scientists cannot draw any conclusions about how deltas formed in the past.

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      The picture shows a mountain valley.

Describe how a glacier affected the surrounding land in this valley.

• The glacier made the valley really pretty to look at.

• The glacier did not change the land at all.

• As the glacier deposited rock and boulders that it transported from distant areas. It also eroded soil rock and large boulders from the valley floor and carried them off and deposited them at other distant locations.

• Glaciers are made of ice and the valley has no ice in it . This means that the glacier did not change the valley ay all.

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Weathering processes change the shape of rocks and landforms on Earth’s surface. Describe how rapidly a large boulder would weather compared with the same mass of small pebbles.

• One large rock will weather at a slower rate than the same volume of several smaller rocks because the smaller rocks have greater surface area.

• .

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What is the process by which a river cuts a new channel during a flood?

• The river overflows its banks and deposits sediment.

• As it enters the ocean, a river slows down and drops its sediment.

• A stream leaves a steep mountain valley, enters a flatter plain, and drops its sediment.

• The flow of water erodes soil and rock, cutting a path for the river.

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