Gizmo Warm-up
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...
River Erosion Gizmo
Gizmo Warm-up
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?
2. Now select the right movie camera to see the bank of the mountain stream. What is happening to
sediments on the bank?
Get the Gizmo ready:
Activity A: Check that Mountain stream and Short-term
erosion are selected.
Mountain streams
If necessary, click outside the circle to close the
zoomed-in view.
1. Calculate: The two red flags are 100 meters apart. Click play to release the barrel. 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?
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?
2. Observe: Turn off Show data. Next to River flow, select Flood. Look at the landscape, and then click on
the movie cameras to see zoomed-in views. Describe what you notice below.
3. Calculate: Click Play to release the barrel. How many seconds does it take the barrel to get from one flag
to the other? What is the speed of the barrel?
Time: Speed:
Get the Gizmo ready:
Activity B:
Select Meandering river.
Meandering rivers Select Short-term erosion, Low vegetation, and
Normal river flow. Turn off Show data.
Introduction: Meandering rivers are found in flatter areas. Unlike the V-shaped mountain valleys, the valleys
of meandering rivers have wide, flat bottoms called floodplains.
1. Observe: Turn off Show labels. Click Play to release the barrel. Observe the path of the barrel as it floats
down the river. (The flags are 100 meters apart.)
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