Do you know the answers?  What is the salinity of water? the amount of salt dissolved in the water  Why is salinity important? if the salinity is too high or too low it will effect the biotic factors of an ecosystem

Human! The Natural Bridge was a sacred site of the Native American Monacan tribe here in Virginia.Native AmericanMonacan olastic.com/studyjam s/jams/science/rocks- minerals- landforms/weatherin g-and-erosion.htm

Weathering  The breakdown of the materials of Earth’s crust into smaller pieces.

Physical Weathering  Process by which rocks are broken down into smaller pieces by external conditions.  Types:  Frost breaking rock  Plant roots  Friction and impact  Burrowing of animals  Temperature changes

Frost Wedging

Frost Heaving

Plant Roots

Friction and Repeated Impact

Burrowing of Animals

Temperature Changes

Chemical Weathering  The process that breaks down rock through chemical changes.  Types:  Water dissolving  Oxygen  Carbon dioxide  Living organisms (urine) or dead decomposing  Acid rain

Water  Water weathers rock by dissolving it

Oxygen  Iron combines with oxygen in the presence of water  The product of oxidation is rust

Carbon Dioxide  CO 2 dissolves in rain water and creates carbonic acid  Carbonic acid easily weathers limestone and marble

Living Organisms  Lichens that grow on rocks produce weak acids that chemically weather rock

Acid Rain  Compounds from burning coal, oil and gas react chemically with water forming acids.  Acid rain causes very rapid chemical weathering

Karst Topography  A type of landscape in rainy regions that causes caves, sinkholes, and disappearing streams.  Created by chemical weathering of limestone

Example of Karst: Sinkholes s.html

Example of Karst: Caves

Example of Karst: Disappearing Streams

Erosion  movement of rocks and soil by water, wind, or ice.

Water Erosion  Rivers, streams, and runoff

Mass Movements  Landslides, mudslides, slump and creep eographic.com/video/ 101-videos/landslides

Ice Erosion  Glaciers

Wind Erosion show/sand_dunes.html

1.) FOLLOW all directions 2.) work with YOUR group 3.) write down you very BEST answer 4.) CLEAN UP your lab station 5.) Turn in to the “IN BOX” 6.) pick up homework – you may start it