Let’s Play Weathering Wind Water Ice Gravity.

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Presentation transcript:

Let’s Play

Weathering

Wind

Water

Ice

Gravity

What’s Left? What’s Left?

Weathe ring WindWaterIceGravity What’s Left?

The breaking down or cracking of rock.

Weathering

The breaking down of rock by physical processes

Mechanical Weathering

Changing a rock’s composition or changing a rock by dissolving

Chemical Weathering

Two examples of Mechanical weathering

Ice wedging, plants & animals, falling from cliffs

Two examples of Chemical Weathering

Natural acids, plant acids, acid rain, dissolving limestone

The major agent of erosion in desert areas.

Wind

Rows of trees planted along fields to slow down SOIL erosion

Windbreaks

The type of wind erosion where smaller sediments are blown away. Large sediments are left behind.

Deflation

Nature’s sandblasting of rocks…

Abrasion

One example of landform created by wind DEPOSITION

Dunes, Loess

The grand canyon formed as a result of this

Water erosion

A type of water erosion that occurs over large, flat areas

Sheet erosion

The reason fertile soil is found at the mouth of a river

Nutrients are deposited along with sediments as a river slows down

One reason why farming pollutes water

Runoff of pesticides and fertilizers when it rains

Compare and contrast an alluvial fan and a delta

Alluvial fan: deposited by a river in a valley delta: deposited by a river at its mouth.

A large, frozen river that moves under its own weight

glacier

Gouges left in rock by glaciers are the result of this process

plucking

Bowl-like depressions formed at the point where glaciers begin

Cirques

Sharp ridges left behind when two side-by-side glaciers erode a mountain

aretes

A valley formed when a glacier erodes a moutain

U-shape valley

Slump, creep, rock falls, and mud slides are all examples of this

Mass movement

The name of the erosion by gravity that causes tree trunks to bend

creep

The cause of all mass movement on Earth

gravity

More material is moved over time by _______ mass movement

Slow

Two methods of making steep slopes safer

Terracing, planting vegetation, using concrete barriers

A _______ connects areas of equal elevation on a topographic map.

Contour line

Lines close together on a map indicate this

Steep slope

Line far apart on a topographical map indicate this

Gentle / gradual slope

A topographic map with a SMALL contour interval indicates this

A relatively flat area

Look at the map on the board. Tell the contour interval and height of the hill.

Contour interval: 25 m Height of hill: m.

FinalJeopardy

Landforms

Discuss any TWO landforms on Earth created as a result of DEPOSITION of sediment.

Dunes, loess, eskers, moraine deposits, beaches, sand bar, outwash deposits, etc.

Daily Double!