Sculpturing Earth’s Surface

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Presentation transcript:

Sculpturing Earth’s Surface Unit 3: Chapter 4

Big Idea/Essential Questions Weathering, Erosion and Deposition continuously alter and shape the earth’s surface. Essential Questions How does mass wasting sculpt the earth’s surface? Explain how chemical weathering alters materials at the earth’s surface? ES Standards: 3.1 SIS Standards 1-4

Key Vocabulary Chemical weathering Differential weathering Eluviation Horizon Lahar Leaching Mass Wasting Mechanical weathering Regolith Soil Profile Solifluction Solum Spheroidal weathering Weathering

Earth’s Processes What are some processes that shape the earth’s surface? External Driven by energy from the sun Breaks apart rock and moves debris Examples: Weathering, Mass Wasting, Erosion Internal Driven by earth’s interior Gradually forms mountains and volcanic activity Example: Plate Boundaries

What are some examples you have seen of weathering? 2 types Mechanical Chemical

Mechanical Weathering Smaller pieces without changing composition Why would smaller pieces weather faster? Types of Frost Wedging (aka Frost Action) Salt Crystals Unloading (aka Exfoliation) Biological Activity

Chemical Weathering Alters composition of rock Types of Water Oxidation Carbonic Acid

What factors would influence the rate at which a rock weathers? Question of the Day What factors would influence the rate at which a rock weathers?

Soil What is soil? Texture is based on size of particles Peds give soil structure; determines porosity and permeability of soil Platy, spheroidal, prismatic, and blocky What do factors due you think control soil formation? How is soil eroded? The rate at which it is eroded?

Mass Wasting What is the driving force behind mass wasting? What are some triggers of mass wasting?

Classifying Mass Wasting Type of Motion Fall Slides Flow Rate of Movement

Types of Mass Wasting Slump Rockslide Debris Flow (aka mudflows) Earthflow Creep Solifluction