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Bell Work. Erosion is __________________________________ ___________________________________________ Sediment is _________________________________ Gravity is ___________________________________ ___________________________________________ Name the four types of mass movement:____________

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Bell work

Bell Work

Erosion is __________________________________

___________________________________________

Sediment is _________________________________

Gravity is ___________________________________

___________________________________________

Name the four types of mass movement:____________

____________________________________________

____________________________________________

____________________________________________

____________________________________________________________________

The process by which natural forces move

weathered rock and soil from one place to another.

the material moved by erosion.

the force that moves rock and other materials

downhill.

Landslide, mudflows, slump, and creep.


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  • Chapter 9 – EROSION & DEPOSITION

  • Changing Earth’s Surface (Gravity) – Monday HW (2/1)

  • Water Erosion – Tuesday HW (2/2)

  • The Force of Moving Water – Wednesday HW (2/3)

  • Glaciers – Thursday – HW (2/4)

  • Waves – Friday – HW (2/5) - worksheet

  • Wind – Monday – HW (2/8)

  • Tuesday, (2/9), we will cover Wind Erosion in class. On

  • Wednesday, February (2/10), we will do a review of Chapters

  • 8 and 9 via a Jeopardy game. Test next Thursday, (2/11)

  • will cover Chapters 8 and 9. Weathering and Soil Formation

  • and Erosion and Deposition.


Water erosion

Key Concepts

What process is mainly responsible for shaping the surface of the land?

What features are formed by water erosion and deposition?

What causes groundwater erosion?

Key Terms

Runoff Flood plainMeander

Rill Oxbow lakeAlluvial fan

Gully DeltaGroundwater

Stream StalactiteStalagmite

Tributary Karst topography

Water Erosion


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_____________ is the major agent of the erosion that has

shaped Earth’s land surface. As water moves over the land,

it carries these particles with it. This moving water is called

______.

Moving water

_________ is water that moves over Earth’s surface. When water flows in a thin sheet over the land, it may cause a type of erosion called sheet erosion.

runoff

Runoff

Amount of Runoff Depends on 5 Main Factors

  • ______________

  • _________ – how would grasses, shrubs, and trees reduce

  • runoff?

  • ___________ – some types absorb more water than others

  • _________________ (steeply sloped Vs flatter land)

  • ______________________ (Paved parking lots do not

  • absorb water, unless, of course, they have cracks!)

Amount of Rain

Vegetation

Type of Soil

Shape of the Land

How People Use the Land

Generally, more runoff means more erosion. In contrast,

factors that reduce runoff will reduce erosion.


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Rills and Gullies

Because of gravity, runoff and the material it contains move downhill. As runoff travels, it forms tiny grooves in the soil called ____. As

many rills flow into one another, they grow larger forming gullies. A

gully _______________________

____________________________________.

rills

is a large groove, or channel,

in the soil that carries runoff after a rainstorm.

Streams and Rivers

Gullies join together to form a larger channel called a ________.

A ______ is a channel along which water is continually flowing down a slope. Unlike gullies, streams rarely dry up. A large

stream is often called a river.

stream

stream

A stream grows into a larger stream or river by receiving water from_________. A ________ is a stream or river that flows into a larger river.

Tributaries

tributary

tributaries


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Erosion by Rivers

Through erosion, a river creates valleys, waterfalls, flood plains, meanders, and oxbow lakes.

Waterfalls may occur where a river meets an area

of rock that is very hard and erodes slowly. The river

flows over this rock and then flows over softer rock downstream. The softer rock wears away faster than the harder rock. Eventually a waterfall develops where the softer rock was removed.

Waterfalls

Flood Plain

The flat, wide area of land along a river is a flood plain. A river often covers its flood plain when it overflows its

banks during floods.

Meanders

A meander is a loop-like bend in the course of a river.

An oxbow lake is a meander that has been cut

off from the river. An oxbow lake may form when a river floods.

Oxbow Lakes


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Daily Streamflow Conditions:

Visit PHSchool.com, Web Code: cfd-2032


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Deposits by Rivers

As water moves, it carries sediments with it. Any time moving water __________, it drops or deposits some of the sediment.

slows down

Deposition creates landforms such as alluvial fans and deltas. It can also add soil to a river’s flood plain.

When a stream flows out of a steep, narrow mountain valley, the stream suddenly becomes wider and shallower. The water slows down. Here sediments are deposited in an ____________ – a wide, sloping deposit of sediment formed where a stream leaves a mountain range.

Alluvial Fans

alluvial fan

Deltas

A river ends when it flows into a still body of water, such

as an ocean or lake. Because the water no longer flowing

downhill, the water slows down. At this point, the sediment in the

water drops to the bottom. A ______ is a landform built by the

sediment deposited as a river flows into an ocean or lake.

delta

Deposition can also occur during floods. Deposition of new soil over a flood plain is what makes a river valley fertile.

Soil on Flood Plains


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When rain falls or snow melts, not all

of the water evaporates or becomes runoff. Some water soaks

into the ground. There it fills the openings in the soil and trickles

into cracks and spaces in layers of rock. ___________ is the term geologists use for this underground water. Like running water on the surface, groundwater affects the shape of the land.

Groundwater Erosion

Groundwater

Groundwater can cause erosion through a process of chemical weathering. When water sinks into the ground, it combines with carbon dioxide to form a weak acid, called carbonic acid. Carbonic acid can break down limestone.

Cave Formations

The action of carbonic acid on limestone can also result in deposition. Water containing carbonic acid and calcium from limestone drips from a cave’s roof. A deposit that hangs like an icicle is known as a _________. Slow dripping

Builds up a cone-shaped __________ from the cave flow.

stalactite

stalagmite


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Karst Topography

In rainy regions where there is a layer of

Limestone near the surface, groundwater erosion can significantly change the shape of the land. Streams are rare because water easily sinks down into the weathered limestone.

Roof of caves can collapse because of the erosion of underlying limestone, the result is a depression called a sinkhole. This type of landscape is called karst topography after a region in Eastern Europe. In US, regions of karst topography found in Florida,

Texas, and many other states.

Page 280, Fig. 11 has Karst Topography in the U.S.

Cenote – in Cancun, Mexico


Grand canyon erosion and deposition

Grand Canyon – Erosion and Deposition


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