The largest division of geologic time is a(n) a.Period b.Era c.Epoch d.Geological Time Scale
What is erosion? Erosion is the transport (movement) of weathered rocks and sediment from one place to another. Erosion is usually gradual… Humans can speed it up.
What are the agents of erosion? Wind Water Waves Glaciers (ice) Gravity (mass movement, mass wasting)
What is the evidence that sediment is being moved from one place to another?
Copyright © Marli Miller, University of OregonUniversity of Oregon Wind moved the sand into a dune.
A glacier is a “river” of ice that slowly moves downhill. As it travels, it breaks off rock and carries it to a new location – EROSION! Copyright © Marli Miller, University of OregonUniversity of Oregon Rocks moved by a glacier. This is glacier deposition. What does the word “deposit” mean? Copyright © Bruce Molnia, Terra Photographics
What is deposition? What goes up must come down. What is carried must be… dropped. Deposition occurs when agents of erosion deposit (lay down, drop) sediment.
How do waves change Earth's surface? Sand bars Longshore drift
How do glaciers change Earth's surface? Large mass of moving ice and snow Plucking Abrasion
How does gravity change Earth’s surface? Rapid Mass Wasting… Landslide Mudflow
How does slow mass wasting erode rocks? Creep Slump Slow mass wasting…
How does wind change Earth's surface? Deflation Sand dunes
Poor soil conservation… What caused the Dust Bowl in the 1930s?
Running water Load deposits How does water change Earth's surface?
Delta Alluvial fan How is a river's load deposited?
Stalactites and stalagmites And underground…
Worktime Have the rubric in front of you Get the information first Then, get do all the “fancy” stuff