Agents of Weathering
Tuesday 11/29/16 JOURNALS open to RIGHT SIDE p. 39 Title: Agents of Weathering Be ready for foldable notes! Fold your paper so that you have 6 doors on the left and right
Mechanical The type of weathering in which rock is physically broken into smaller pieces.
(Also called exfoliation) Release of Pressure Pressure on the rock is released by erosion causing the outside of the rock to flake and crack off. (Also called exfoliation)
Freezing and Thawing Water freezes in a crack, expands, and makes the crack bigger, sometimes breaking it off. Also known as “ice wedging”.
Plant Growth Roots from trees and plants grow inside cracks, expanding it farther, possibly breaking it apart over time. (Caused by geotropism/force of gravity)
Abrasion Grinding away of rock by rock particles which are then carried away (erosion) by wind, ice, water, or gravity.
Animal Action Animals that burrow in the ground loosen and break apart rocks in the soil (this can include humans).
Chemical Weathering Rock is broken apart through chemical changes and rock now has a new composition!
Most important agent of chemical weathering. It dissolves the rock. Water (H2O) Most important agent of chemical weathering. It dissolves the rock.
Oxygen (O2) Oxygen combines with iron (Fe) in the presence of water to cause rust (oxidation).
Carbon Dioxide (CO2) Carbon dioxide combines with water to form a weak acid called carbonic acid. This acid easily weathers marble and limestone.
Living Organisms Plants produce weak acids that slowly dissolve rock usually around the root. Animals also produce acid in their waste. All living organisms produce acids when they decay.
Acid Rain Pollution in the air combines with water vapor in clouds to form rain that is acidic.
Wednesday 11/30/16 JOURNALS open to LEFT side p. 38: Title: Jigsaw 3x3 chart for W-E-D (make your paper look like mine) *Stemscopes due FRIDAY
DEFINITION E D W Erosion Deposition Weathering The process by which water, ice, wind, or gravity moves weathered rock or soil. D Deposition The process in which sediment (small pieces of rock) is laid down in new locations. W Weathering The chemical and physical processes that break down rock at Earth's surface. DEFINITION
E Erosion D Deposition W Weathering ILLUSTRATION
SENTENCE E D W Erosion Deposition Weathering The flow of water is an example of erosion. D Deposition Rocks can be deposited at the bottom of the stream. W Weathering Canyons are formed by the weathering of ice wedging. Weathering causes landforms to break apart. SENTENCE
Song!
Thursday 12/1/16 PLEASE DO NOT TOUCH LAB SUPPLIES Journals open to p. 34 –glue in lab paper before the bell rings Agenda in your planner In your seat ready for our exploratory stations lab!
Friday 12/2/16 After test: 1) Stemscopes DUE TODAY Journals only. Open to p. 34 Agenda in your planner. Pen/pencil. Everything else off your desk before the bell. After test: 1) Stemscopes DUE TODAY 2) RAFT- must include 1 illustration and color