Activities for Exhibit Exploration

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1 Activities for Exhibit Exploration Grade 8 This worksheet will help guide you as you investigate our exhibits. Name(s): Time to Complete: 2 hours A. WATER SYSTEMS Forest Lane 1. Find the map of the Great Lakes and examine each lake closely. Which lake do you think has the coldest water? Provide at least two reasons to support your hypothesis. Lake Superior has the coldest water. It is the deepest of the Great Lakes, and has the largest surface area (and therefore has a significantly larger volume than the other lakes). It also extends furthest north. Great Lakes Map 2. Visit the Cohon Family Nature Escape and look around for evidence of watershed management. List materials that you think help manage the water flow. There is a large grate to the left of the sign to catch springtime water run-off. Students may also identify pebbles or mulch as pervious (permeable) materials that absorb stormwater run-off. Cohon Family Nature Escape (outside) 3. The Science Centre is located in a river valley. What is the name of the river? Don River 4. Check out the map of the watershed this river is part of. a. Where is the source for this river system located? Oak Ridges Moraine b. Find the grate near the map. Why would this grate be installed here? Would you consider this to have a positive or negative impact on the urban forest? The grate is there to take away springtime run-off and heavy rainfall flooding from the Science Centre. This benefits the Centre in that it prevents floods, but a negative impact would be that the water is not available for plants. School Programs Lead Sponsor

2 5. Find the exhibit called Treating Water Right. a. Sample water fountains A, B and C. Which do you prefer? Answers will vary. The Living Earth b. Enter your choice in the computer. What type of water did you choose? A = bottled water, B = filtered water, C = tap water c. What sample do most people prefer? Answers will vary. Treating Water Right 6. Proceed through the Rainforest to the other side of the Living Earth. Find the mural labelled Trashing Our Oceans. Examine the plastic trash in one of the cases. a. How many pieces of garbage can you identify? List up to ten items below. Answers will vary. Trashing Our Oceans b. Where do you think the garbage came from? This plastic originated in the Great Pacific garbage patch. Before it arrived there, most of it came from North America and Asia. Most of the garbage is plastic, because plastic is inexpensive, durable, and slow to biodegrade. c. What can we do to prevent plastic pollution in our oceans? Answers will vary, but may include the following: Reduce your use of plastics Choose recyclables over disposables Recycle Clean up litter

3 A Answer Key B. SYSTEMS IN ACTION 7. Find the giant lever (the sign says Your Weight by the Law of Levers). a. Get on the lever, and walk very slowly away from the fulcrum. Stop as soon as the lever begins to pivot downward. Make a note of where you stopped on the lever, and mark it on the picture to the right. Science Arcade b. Ask a friend to repeat step a. c. According to your experiments, who is heavier: You or your friend? Answers will vary. How can you tell? Hint: Think about the distance to the fulcrum. The person who was closer to the fulcrum when the lever pivoted is heavier. They would have a smaller number on the scale to the right. Your Weight by the Law of Levers 8. Look on the other side of the giant lever to find the Fulcrum and Leverage exhibit (see image below). a. Which weight feels heaviest? C b. Which weight feels lightest? A c. Which lever moved your hand the most? A d. Which lever moved the weight the most? C B C For further exploration: Try out the pulleys at Strength is Not Always the Answer.

4 C. FLUIDS 9. Find the Cartesian Diver exhibit. a. What happens to the fish when you press and hold the button? The fish sank to the bottom of the water column. Science Arcade b. After you pressed the button, was the fish more or less dense than the water around it? The fish was more dense than the water around it. c. Try the experiment again, and look closely at the bubble of air inside the fish. Draw a quick sketch of the fish before and after you press the button: Cartesian Diver The air bubble inside the fish should be slightly smaller in the after picture. Before After d. Think about the air bubble inside the fish. After you pressed the button, did the air molecules move closer together, or father apart? The air molecules inside the fish moved closer together. 10. Find the exhibit called Blowing up a Balloon. a. Press the red button to remove the air from underneath the bell jar. What happened? The balloons expanded. b. If you know that air did not enter or leave the balloon, can you explain what happened? Hint: Did the air molecules inside the balloon move closer together or farther apart? The air molecules inside the balloon moved farther apart. Blowing up a Balloon

5 D. CELLS 11. Find the exhibit called Living Liquid. a. Sketch a red blood cell and a white blood cell in the boxes below. How much of your blood is made of each cell type? The AstraZeneca Human Edge Living Liquid > 40% of human blood 1% of human blood Red Blood Cell White Blood Cell b. A cell s nucleus contains DNA. Mature red blood cells do not have a nucleus. Can you guess how this would be helpful to the function of the red blood cell? The answer cannot be found in the exhibit, so if you are unsure, ask a staff member (or Google). A cell s nucleus takes up a lot of space. Maturing red blood cells lose their nucleus, so they have as much room as possible for hemoglobin (which transports oxygen). Human cell showing nucleus 12. Find the large mirror, labelled Have a Heart. Follow the instructions, and observe an average heart. (If the exhibit is busy, you may watch someone else trying it out.) Next, ask a friend to observe the athlete s heart. a. Can you spot the differences between the two? Hint: Look at the size and the number of beats per minute. The athlete s heart is larger and has fewer beats per minute. b. Try to explain why the athlete s heart is different. Hint: How would regular exercise change your heart? Regular endurance exercise increases the size of the heart. A larger heart pumps blood more efficiently (more blood pumped with each beat), so fewer beats per minute are required. Have a Heart

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