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Weathering

Published on Nov 18, 2015

For teaching 4th graders about processes which break down rocks into smaller pieces. Both physical/mechanical and chemical weathering are covered.

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PRESENTATION OUTLINE

1.

WEATHERING

How does nature break rocks?
Photo by SergioTudela
2.

PHYSICAL/MECHANICAL

BULLDOZERS OF ICE, U SHAPED VALLEYS, ROCK FLOUR
3.

EXFOLIATION

HEATING AND COOLING, EXPANDING AND CONTRACTING
Photo by S. Rae
4.

RIVERS AND STREAMS

ROLLING STONES, BOUNCING AND BREAKING
Photo by Ian Sane
5.

WAVES

RIVERS END AT THE OCEAN. WAVES TAKE OVER.
Photo by Matthias Rhomberg
6.

WIND

WHERE WATER ISN'T FLOWING, WIND HELPS OUT.
Photo by MtErebus
7.

BIOLOGICAL

THIS TREE HAS PERSISTENT ROOTS
Photo by holdit.
8.

SO DOES THIS WEED

Photo by musubk
9.

LICHEN GETS IN ON THE ACT

Photo by thoughtfactory
10.

CHEMICAL WEATHERING

RAIN AND CARBON DIOXIDE MAKE CARBONIC ACID
Photo by OregonCavesNPS
11.

LOOK OUT LIMESTONE AND MARBLE

Photo by Snurb
12.

OXIDATION

RUST THAT ROCK
Photo by Al_HikesAZ

David Lindsay