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Earth’s Surface Erosion. Vocabulary Erosion- the process that wears down and carries away rocks and soil Erosion- the process that wears down and carries.

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Presentation on theme: "Earth’s Surface Erosion. Vocabulary Erosion- the process that wears down and carries away rocks and soil Erosion- the process that wears down and carries."— Presentation transcript:

1 Earth’s Surface Erosion

2 Vocabulary Erosion- the process that wears down and carries away rocks and soil Erosion- the process that wears down and carries away rocks and soil

3 Erosion Gravity acts as a force of erosion by causing a mass movement Gravity acts as a force of erosion by causing a mass movement Mass movement- a process that moves sediment down a hillMass movement- a process that moves sediment down a hill There are 4 ways a mass movement may occur

4 Mass Movement Landslide- a rapid movement of large amounts of rock and soil Landslide- a rapid movement of large amounts of rock and soil

5 Mass Movement Mudflow- a rapid downhill movement of a mixture of water, rock and soil Mudflow- a rapid downhill movement of a mixture of water, rock and soil

6 Mass Movement Slump- mass of rock and soil suddenly slips down a slope Slump- mass of rock and soil suddenly slips down a slope This is different from a landslide because it comes down in one large massThis is different from a landslide because it comes down in one large mass

7 Mass Movement Creep- a very slow movement of rock and soil Creep- a very slow movement of rock and soil Usually creeps cause objects to sit at unusual anglesUsually creeps cause objects to sit at unusual angles

8 Water Erosion Stream- a channel along which water continually flows Stream- a channel along which water continually flows River- a large stream usually forming from several streams flowing together River- a large stream usually forming from several streams flowing together

9 Features of Streams Flood Plain- a flat area along a stream that is entirely covered only during times of floods Flood Plain- a flat area along a stream that is entirely covered only during times of floods Meander- the winding and bending of a stream as it erodes the land Meander- the winding and bending of a stream as it erodes the land Only older streams do thisOnly older streams do this Oxbow Lake- when sediment builds up, cutting off the meander from the rest of the river, causing a separate, curved lake Oxbow Lake- when sediment builds up, cutting off the meander from the rest of the river, causing a separate, curved lake

10 Water Erosion Fast moving rivers that are straight and narrow cut steep slopes and create a V- shaped valley Fast moving rivers that are straight and narrow cut steep slopes and create a V- shaped valley Example- Grand CanyonExample- Grand Canyon

11 Grand Canyon

12 Water Erosion Waterfall- a river cuts through soft rock faster than hard rock Waterfall- a river cuts through soft rock faster than hard rock Example- Niagara FallsExample- Niagara Falls

13 Niagara Falls

14 Groundwater Erosion A form of chemical erosion A form of chemical erosion Makes caves and sinkholes Makes caves and sinkholes CAVE- limestone erodes away, leaving behind a dry narrow passageCAVE- limestone erodes away, leaving behind a dry narrow passage SINKHOLE- weakened limestone where the entire portion of the ground suddenly collapsesSINKHOLE- weakened limestone where the entire portion of the ground suddenly collapses

15 Glacial Erosion Glaciers erode land in 2 ways Glaciers erode land in 2 ways Plucking- as a glacier flows over land it picks up rocksPlucking- as a glacier flows over land it picks up rocks Abrasion- gauges and scratches in rocks as a glacier drags across landAbrasion- gauges and scratches in rocks as a glacier drags across land Causes large, bowl shaped valleys called cirques Causes large, bowl shaped valleys called cirques Cuts U-shaped valleys in landforms Cuts U-shaped valleys in landforms May leave behind large, cold glacial lakes May leave behind large, cold glacial lakes

16 Wind Erosion Deflation- wind picks up and carries away small particles Deflation- wind picks up and carries away small particles The faster the wind, the larger the particles it can carryThe faster the wind, the larger the particles it can carry Example- Sand dunes


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