Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
True or False: The Earth’s surface has stayed the same for thousands of years True or False: The Earth’s surface has stayed the same for thousands of years The Earth’s surface is always changing! Weathering The breakdown of the Earth’s crust into smaller pieces. Water causes weathering What evidence of weathering do you see in this picture? Wind causes weathering Why wasn’t this mass of land weathered away? What evidence of weathering do you see in this picture? Ice & Heat cause weathering Describe how ice/heat cause weathering? Erosion The process of water, ice, wind or gravity moving fragments of rock and soil. What evidence of erosion do you see in this picture? Erosion is Movement of Sediment! • Erosion is gradually wearing down the surface of the earth. • Erosion carves the Earth's surface creating canyons, gorges, and even beaches. What do you think has caused this rock to look this way? 1) Wind Erosion • As the wind blows it picks up small particles of sand/sediment and blasts large rocks with the abrasive particles, cutting and shaping the rock. Wind Erosion 2) Water Causes Erosion • runoff, rivers and, streams 1) 2) 3) Canyons This simple animation provides you with a visualization of how the Colorado River has "downcut" into the rock layers of the Grand Canyon. Canyons are large valleys created by a river or stream. How long it took to carve the Grand Canyon is debated by geologists. Some estimates are between 6 and 8 million years, which is very recent by comparison. 3) Ice Causes Erosion Glaciers wear down the landscape; by picking up and carrying debris that moves across the land along with the ice. Ice Causes Erosion Glaciers can pick up and carry sediment that ranges in size from sand grains to boulders bigger than houses !!! Moving like a conveyor belt and a bulldozer, a single glacier can move millions of tons of material! 4) Gravity causes erosion Creep, Slump, Landslides, Mudslides, and Avalanches. Slower Faster These are examples of mass movement (or called mass wasting) Did you know? Plants CAN CAUSE weathering !!! BUT, Plants CAN PREVENT erosion. The Candy Cane Lab! • Materials: • 1. One candy cane • 2. Regular pencil and a red colored pencil • 3. Lab experiment paper • 4. Piece of waxed paper Time to begin! • 1. Draw the candy cane in box 1 on your lab sheet. Scientific Illustration! (Color, size, etc.) • 2. Unwrap your candy cane. • 3. Place in your mouth, you may suck on it but no biting or crunching !!! (No natural disasters) • 4. The timer will tell you when to take the candy out of your mouth. Two minutes for each box. Draw • Look closely at your candy cane. Draw the candy cane in box 2. Be sure to draw the changes. • • • • Size Color !! Shape texture http://www.youtube.com/watch?v=ZNJe6hrdL3M&feature=youtube_gdata_player Repeat 4 more times 1 2 3 4 5 6 Think • How is your candy cane and a rock the same? • Think about the pressure of sucking on your candy cane . • Think about the saliva and what it represents. • What other elements of weathering were present? • How did your candy cane weather? • Why? • I hope you learned about weathering and enjoyed the TASTY TREAT ! • Remember: Weathering is the breaking of a rocks into smaller pieces. • Erosion is the movement of those pieces from one place to another! • Make sure your name is on your paper. • Turn in for your assessment on weathering. Deposition Rock particles that are picked up and transported during erosion will ultimately be deposited somewhere else Deposition is the process by which sediments (small particles of rock) are laid down in new locations. • Together, Erosion and Deposition build new landforms. • Deltas • Canyons • Meanders • Floodplains Delta Where rivers meet the ocean is called the mouth of the river. Soil and dirt carried by these rivers is deposited at the mouth, and new land is formed. The new, soil-rich land is known as a Delta Meanders Meandering streams wander side to side as they constantly seek out the lowest elevation. This constant motion creates a series of S-shaped “loops”. Meanders Stream Velocity varies from one side to the other side of the “S”, resulting in erosion in some places and deposition of sediments in others. Floodplains • Floodplains form along the banks of mid-order streams and larger rivers. • These are low-lying areas along the sides of a river channel that have regular times of heavy waterflow to cause the river to spill over and flood the land.