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

WEATHERING AND EROSION

Human!

The Natural Bridge was a sacred site of the Native American Monacan tribe here in Virginia.

http://studyjams.scholastic.com/studyjams/jams/science/rocks-minerals-landforms/weathering-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

CO2 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: Sinkholeshttp://pbskids.org/dragonflytv/show/sinkholes.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 http://

video.nationalgeographic.com/video/101-videos/landslides

Ice Erosion Glaciers

Wind Erosionhttp://pbskids.org/dragonflytv/show/sand_dunes.html

Weathering Lab

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