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Constructive, destructive forces

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by

Mia Tijerina

on 21 February 2013

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Transcript of Constructive, destructive forces

Weathering, Erosion, and Deposition Destructive
Forces Physical/Mechanical Weathering Chemical Weathering A type of landscape in rainy regions where there is limestone near the surface, characterized by caves,
sinkholes, and disappearing streams.Created by chemical weathering of limestone Process that destroys landforms Process by which rocks are broken down into smaller pieces by external conditions. The process that breaks down rock through chemical changes. It changes the material.
The agents of chemical weathering
Water, Oxygen, Carbon dioxide, Living organisms, Acid rain Karst Topography Destructive and Constructive Forces Slow - caused by Weathering
Fast - caused by Erosion Constructive Forces Process that builds up an existing landform or creates a new one Agents are:
water, gravity, wind, and glaciers

Examples:
deposition, landslides, volcanic eruptions , and floods The breakdown of the materials of Earth’s crust into smaller pieces. Weathering The breakdown of the materials of Earth’s crust into smaller pieces. Types of Physical weathering
Frost heaving and Frost wedging
Plant roots
Friction and impact
Burrowing of animals
Temperature changes Water weathers rock by dissolving it Water Compounds from burning coal, oil and gas react chemically with water forming acids.
Acid rain causes very rapid chemical weathering Acid Rain CO2 dissolves in rain water and creates carbonic acid
Carbonic acid easily weathers limestone and marble Carbon Dioxide Iron combines with oxygen in the presence of water in a processes called oxidation
The product of oxidation is rust Oxygen Lichens that grow on rocks produce weak acids that chemically weather rock Living Organisms Burrowing of Animals Friction and Repeated Impact Plant Roots Frost Heaving Frost Wedging Temperature Changes Features of Karst: Caves Features of Karst: Sinkholes Features of Karst: Disappearing Streams Erosion The process by which water, ice, wind or gravity moves fragments of rock and soil Wind Erosion Glaciers Ice Erosion Rivers, streams, and runoff Water Erosion landslide clip.mpeg Landslides, mudslides, slump and creep Mass Movements Deposition the dropping of transported materials (sediments), or the process by which transported materials are left in new locations.
Depositions can create new landforms like beaches and sand dunes. Includes volcanoes, earthquakes, landslides, and floods.
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