Weathering

Document Sample
Weathering Powered By Docstoc
					          Weathering
   No atmosphere, no weathering
     Mechanical Weathering

Examples: exfoliation, frost action,
            abrasion
Exfoliation
Frost Action – water and alternating temps.
Frost Action
Abrasion – smooth corners, decreases size
     Weathering
  Chemical Weathering

          Examples:
lichen, limestone, acid rain
Lichen: secrete acids, composite organisms consisting of a
symbiotic association of a fungus with a photosynthetic partner, usually

either a green algae or cyanobacterium
Lichen
   Limestone       Dry (arid) climate




no chemical weathering   – notice sharp corners)
         Limestone humid climate
  causes solution weathering – notice rounded
features, headstone carvings becoming illegible)
Limestone (solution weathering)
Acid Rain
Acid Rain
Weathering
   Differential
   Weathering
Helps make rock
strata and features      The Grand Canyon.
really stand out.

 Examples:
 Horizontal bedding, cross bedding,
 graded bedding
  Differential Weathering
More resistant forms a
cliff or ridge (sticks out).




Less resistant erodes back
(concave) creates slopes or
forms valleys.
Differential Weathering
Differential Weathering
Differential Weathering
Such pretty cross bedding
Graded
bedding
       START Definitions
   Sedimentary Rocks Vocab.
• Grab the Orange Book page 61 in the
  back of the room

				
DOCUMENT INFO
Shared By:
Categories:
Tags:
Stats:
views:13
posted:3/21/2012
language:English
pages:23