River_Erosion_Lab GIZMO questions &answers 2021/22

The image above shows a raging mountain river in full flood. What do you think is making the water brown in color? The dirt from the mountain is making the river brown. 2. What impact do you think the flooding river will have on the surrounding landscape? The impact that the flooding river will have on the surrounding landscape I think is that the soil will not me stable and landslide have a higher possibility of happening. Gizmo Warm-up If you stand by the bank of a river, it may seem that very little is happening. But over thousands and even millions of years, rivers can have a profound effect on the landscape. In the River Erosion Gizmo, you will see how rivers move materials and how they affect landscapes. To begin, check that Mountain stream and Short-term erosion are selected. The Gizmo shows a typical stream that is moving through a hilly area. 1. The two movie cameras ( ) allow you to observe different parts of the stream up close. Click on the left movie camera. What do you see? On the left movie camera, I see under the surface on the river and I see a fish swimming. 2. Sediments are small rock fragments such as sand or pebbles. What evidence do you see that sediments are being transported? On the right camera, sediments are falling into the river and the river’s current moving the sediment along with it. 3. Now select the right movie camera to see the bank of the mountain stream. What is happening to sediments on the bank? The sediments on the bank are being push/ transported by the river’s current. Activity A: Mountain streams Get the Gizmo ready:  Check that Mountain stream and Short-term erosion are selected.  If necessary, click outside the circle to close the zoomed-in view. Introduction: Erosion occurs when sediments and other materials are moved from one place to another. Along with weathering, which is the breakdown of large rocks into smaller sediments, erosion can have a profound impact on the landscape. Question: How does river erosion affect landscapes in the mountains? 1. Label: First, get to know some of the different parts of a mountain stream. Turn on Show labels. Label the image to the right, then fill in the word that goes with each description. A small stream that flows into a larger stream: Tributary A place along a stream where water drops straight down: Waterfall A letter that describes the shape of a typical mountain valley: V-shape valley The side of a stream: Streambank The bottom of a stream: Streambed 2. Observe: Turn off Show labels. Next to “Release barrel,” click Play ( ). Observe how fast the barrel moves as it floats down the stream. What happens when the barrel goes over the waterfall? When the barrel goes over the waterfall, the barrel quickly tumbles down with tipping over. 3. Calculate: The two red flags are 100 meters apart. The time at which the barrel passes the flag is shown. Remember, there are 60 seconds in a minute. A. How many seconds did it take for the barrel to go 100 meters? It takes the barrel 91 seconds to go 100 meters B. To find the barrel’s speed, use a calculator to divide the distance traveled (100 m) by the time it took the barrel to float 100 m. The units are meters per second (m/s). What is the speed of the barrel? 100/91= 1.098 The speed of the barrel is about 1.1 m/s.