Weathering Erosion and Deposition. Presented by Kesler Science
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1 Weathering Erosion and Deposition Presented by Kesler Science
2 Essential Questions: 1. What effects do weathering, erosion, and deposition have on the environment in ecoregions?
3 Weathering Chemical and physical breakdown of rocks into sediment Occurs when the rock s environment changes and the rock is exposed to some form of water and the air
4 Quick Action INB Template Chemical and Mechanical Weathering INB Template 1. Cut out the template and cut on all solid lines. 2. Glue the small tabs into your INB. 3. Fold along dotted lines to open the flip book.
5 Chemical Weathering Chemical change within the rock s minerals breaking down the bonds holding the rocks together, causing them to fall apart into smaller pieces.
6 Quick Action INB Template Chemical Weathering INB Template 1. Cut out the template and cut on all solid lines. 2. Glue the back of the section that read Chemical Weathering to your INB. 3. Fold along dotted line to create 3 flaps.
7 Chemical Weathering (Cont.) Causes rock to break: (A) Oxidation Iron combines with oxygen making rust. (B) Hydrolysis Water softens minerals in rocks. (C) Carbonation Carbon dioxide in rain water creates carbonic acid. Ex. acid rain, cave creation 2 ND PERIOD FINISHED THIS SLIDE B A C
8 Quick Action INB Template Mechanical Weathering INB Template 1. Cut out the template and cut on all solid lines. 2. Glue the back of the section that read Chemical Weathering to your INB. 3. Fold along dotted line to create 3 flaps.
9 A2 A1 Physical (Mechanical) Weathering The process that breaks rocks apart without changing their chemical composition caused by: Glacial/Ice: (A1) Abrasion - by rapidly moving water, glaciers or wind. (A2) Ice wedging - by freezing and thawing (contracting and expansion).
10 Physical Weathering (cont.) Causes rock to break: (B) Plant Roots - grow into cracks and break apart rock. (C) Burrowing animals scrape and dig the terrain. (D) Temperature Changecold to hot expanding and contracting. (E) Gravity - falling rocks or debris, compression B D C E
11 Quick Action INB Template Erosion INB Template 1. Cut out the template along the solid lines 2. Glue the tab from the water template to the back of the wind template. 3. Glue the skinny tab that says draw and explain to your INB. 4. Fold up along the dotted lines.
12 Erosion The process that moves bits of rock or soil from one place to another by: Gravity Water (rivers, waves) Wind Ice (glaciers)
13 Quick Action - Weathering, Erosion and Deposition Lets review weathering and erosion. Play the following YouTube video. Erosion and Weathering Hard Rock Life Song
14 Deposition The process in which sediments, soil, and rocks are added to a landform such as: Deltas Flood plains Sandbars Dunes
15 Deposition Occurs when the forces moving sediments are no longer able to overcome the forces of gravity and friction.
16 What affects transportation of sediments? Running water is the primary agent of erosion. Velocity or running water depends on gradient(slope), discharge (amount of water). As velocity increases the size of particles carried increases.
17 Ages of Rivers (A) Young Rivers - fast-flowing, V-shaped valleys, waterfalls, and rapids (B) Mature rivers Less energy, slower, meanders (1), sandbars (C) Old River Very slow, shallow, large amounts of sediment deposited, many narrow channels, islands, deltas (2)
18 Quick Action Erosion and Deposition 1. Working with a partner and decide which picture matches the description of each river age. Young River Mature River Old River A B 2. Make a sketch of each picture in your INB, be sure to include labels. C
19 Features Created by Wind Caused by abrasion from wind blown sand. Arches Sand dunes Mushroom Rocks (FIRST PD DID THIS
20 Features Created by Gravity Gravity shapes the Earth s surface by moving weathered material from a higher place to a lower one. (A) Landslides (fast) (B) Mud flows (C) Slump/creep (slow) A C B
21 Features Created by Glaciation Caused as massive glaciers flow down hill bulldozing existing rocks. U-Shaped Valley Hanging Valley Horn Moraine Cirque Tarn lake Arête
22 Features Created by water (waves) Erosional and depositional features which form along coastlines The western U.S. coastline has more erosional features. The eastern U.S. coast and the Gulf of Mexico has more depositional features.
23 Quick Action Erosion and Deposition 1. Get with a partner and discuss the features in these pictures. 2. Match each picture with one of the four agents of erosion (water, wind, ice, waves and gravity). 3. Draw each picture in your INB and label the features and type of erosion that created it.
24 Ecoregions of the United States Areas defined by its environmental conditions, especially climate, landforms, and soil characteristics.
25 Ecoregions Environmental Conditions Climate weather conditions in an area over time. Tropical Arid Mediterranean Landforms crustal material Mountains high elevation Plateaus medium to high elevation Plains low elevation Soil characteristics Amount of vegetation Dry (arid) very little vegetation (poor soil) Humid large amount of vegetation (good soil)
26 Examples of Ecoregions Subtropical (Florida, South Eastern States) Tundra (N Alaska) Temperate Steppe (Great Plains Marine Mountains (Coastal Washington and Oregon) Desert and Desert Mountain (Nevada and parts of New Mexico)
27 Quick Action - Weathering, Erosion and Deposition What determines how the processes of weathering, erosion, and deposition work to reshape Earth s surface? Rivers Rock formations Soils Topography Precipitation
28 Quick Action Weathering, Erosion and Deposition 1. Get with a partner to discuss the 4 Texas maps on the next two slides. 2. Make a list of similarities and differences in the 4 maps. 3. Compare your list to the map of Texas Ecoregions. 4. How are the Texas Ecoregions similar to the 4 Texas maps? 5. Choose one Ecoregion in Texas and list characteristics you found for that region. 6. What makes this Ecoregion different from all other Ecoregions?
29 Quick Action - Weathering, Erosion and Deposition Elevation Soil/Topography
30 Quick Action - Weathering, Erosion and Deposition Precipitation Rivers
31 Check for Understanding Can you Analyze the effects of weathering, erosion and deposition on the environment of ecoregions.
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