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Weathering

Published on Nov 25, 2015

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PRESENTATION OUTLINE

1.

WEATHERING

Photo by D. [SansPretentionAucune] (•̪●) ✪
2.

2 things work together to continually wear down and carry away rock on Earth's surface:
Weathering and Erosion

Photo by Krister462
3.

WEATHERING

THE PROCESS THAT BREAKS DOWN ROCK INTO SMALLER PIECES
Photo by rda
4.

EROSION

THOSE ROCK PARTICLES GET CARRIED AWAY BY WIND, WATER, ICE & GRAVITY
Photo by Muse Rosli
5.

2 TYPES OF WEATHERING

MECHANICAL AND CHEMICAL
6.

FIRST TYPE: MECHANICAL WEATHERING

WHEN ROCK IS PHYSICALLY BROKEN INTO SMALLER PIECES
Photo by AlishaV
7.

5 CAUSES OF

MECHANICAL WEATHERING
8.

1. FREEZING & THAWING (ICE WEDGING)

H2O SEEPS IN ROCK, FREEZES, EXPANDS, CRACKS ROCK INTO SMALLER PIECES
Photo by lvanvlee8
9.

2. RELEASE OF PRESSURE

SURFACE ROCK ERODES, LESS PRESSURE, ROCK FLAKES LIKE ONION LAYERS
Photo by Nick Bramhall
10.

3. GROWTH OF PLANTS

ROOTS GROW INTO CRACKS AND PUSH ROCK APART
Photo by grindlock
11.

4. ANIMALS

BURROW AND PUSH APART ROCK
Photo by Tatiana Gettelman
12.

5. ABRASION

SAND & ROCK CARRIED BY WIND, WATER & ICE WEARS AWAY SURFACE ROCK
Photo by Banco de Imágenes Geológicas
13.

OK, HERE COMES THE SECOND TYPE OF WEATHERING...

14.

SECOND TYPE: CHEMICAL WEATHERING

THE PROCESS OF BREAKING DOWN ROCK THROUGH CHEMICAL CHANGES
Photo by james_gordon_losangeles
15.

5 AGENTS THAT

CAUSE CHEMICAL WEATHERING
16.

1. WATER

DISSOLVES ROCK CHEMICALLY
Photo by `James Wheeler
17.

2. OXYGEN

ROCK THAT HAS IRON IN IT MIXES WITH OXYGEN AND RUSTS
Photo by sjrankin
18.

3. CARBON DIOXIDE

CO2 DISSOLVES IN RAINWATER AND WEATHERS MARBLE & LIMESTONE
Photo by melissambwilkins
19.

4. LIVING ORGANISMS

ACIDS FROM PLANTS AND ROOTS CHEMICALLY WEATHER ROCK
Photo by Daniel Peckham
20.

5. ACID RAIN

AIR POLLUTION REACTS WITH CLOUDS AND FALLS ON ROCK AS ACID RAIN
Photo by revedavion.com
21.

CHEMICAL WEATHERING CHANGES

THE MINERAL MAKE UP OF THE ROCK
Photo by quapan
22.

RATE OF WEATHERING

HOW FAST ROCK CHANGES DEPENDS ON A FEW FACTORS
Photo by Kiran K.
23.

TYPE OF ROCK

  • Mineral make up of the rock
  • Its hardness or softness
  • How permeable (full of holes) it is
Photo by Vicki & Chuck Rogers
24.

CLIMATE

WARM AND WET WEATHER MAKES WEATHERING HAPPEN FASTER
Photo by Matt. Create.
25.

DOES THIS SHOW MECHANICAL OR CHEMICAL WEATHERING?

Photo by -Veyron-
26.

DOES THIS SHOW MECHANICAL OR CHEMICAL WEATHERING?

Photo by jekemp

Lynda Whyte