How does weathering, erosion, & deposition act in a cycle to change the Earth’s surface? -breaks down the Earth Weathering Erosion Deposition - moves the Earth – drops off, to build the Earth

What is Weathering? Must occur before erosion can happen The breaking down of rocks into smaller pieces Must occur before erosion can happen No movement is involved Two types: Mechanical & Chemical Sediments- small/tiny pieces of weathered down rock.

What is Physical Weathering? Physical/Mechanical weathering … the breaking down of rocks into smaller pieces with out changing the material Physical Weathering -- The steep walls here were carved out by moving water Palo Duro Canyon in the High Plains Eco-Region

Enchanted Rock in the Llano Uplift Eco-region Physical Weathering 1. Animal burrowing 2. Plant Roots 3. Ice Wedging 4. Abrasion Enchanted Rock in the Llano Uplift Eco-region 5. Exfoliation-warming and cooling of rocks over time causes rocks to peel into sheets

What is Chemical Weathering? dissolving and changing the minerals in rocks into new ones. 1. Oxidation-Rusting 2. Plant Acids 3. This cave was formed by slightly acidic water dissolving the limestone (carbonic acids)

What is Erosion? Water Wind Water & Gravity Gravity Example The movement of weathered earth materials by moving water, wind, gravity or ice (glaciers) Example Cause of Erosion Waves eroding the beach and East TX shoreline Water Desert Sandstorm in West TX from drought Wind Rain causing Mudslide in the Rolling Hills of Central TX Water & Gravity Landslide on sides of Plateaus of Central TX Gravity Rain carrying soil down a driveway

Draw and answer the question How does removing plants effect the erosion on the left side of the hill? Draw and answer the question

What is Deposition? Before After Delta Mountains Sand Dunes Plateau When eroded sediments are deposited in a new location Example: delta -- where sediment is deposited where a river flows into an ocean or lake builds up a landform Before After