1. Convection Currents Lab By PresenterMedia.comPresenterMedia.com

2. In your notebook, answer the following: 1.What are convection currents? 2.Make a hypothesis: - How does temperature affect the density of a fluid? (Use “If, then, because” format). Part 1: Pre-lab Questions:

3. Pour the hot water onto one side of the tank and the cold water on the other side of the tank (about half of a plastic cup full). Part 1: Convection Currents Lab Gather the following materials: -Wave tank- hot water (red) - cold water (blue) Make sure the plastic divider is in the middle of the tank. Do not fill more than ½ of each side with water. Follow each step Step 1 Step 2 Step 3 Step 4

4. In your notebook, answer the following: 1.Record your observations: Draw a picture of convection currents. Use red to indicate what happens to heated liquid and blue for cooling liquid. 2.Was your hypothesis correct? Explain. - Make sure you talk about how temperature affects density in your explanation. Part 1: Convection Currents

5. Answer the following in your notebook: 1.Complete the “My Planet Diary” on page 264. *Cut it out and glue in your notebook. 2. How do convection currents occur in the mantle (hint…hint: look on page 267 of your textbook). Part 2: Convection Currents in the Mantle

6. Slowly drop food coloring into the oil. Make sure the droplets stay in the oil. Part 2: Making a Lava Lamp Gather the following materials: -Plastic cup - beaker of water - oil - food coloring - alka-seltzer tablets Pour water into the bottom of the cup. Then, pour the oil into the cup. When instructed, put ½ an alka-seltzer tablet into the cup. Follow each step Step 1 Step 2 Step 3 Step 4

7. Answer the following in your notebook: Water/oil = asthenosphere Droplets of food coloring = rocks in the asthenosphere Alka-seltzer = heat 1.Using the information above, explain how the lava lamp models how convection currents occur in the mantle. (*Include what you know about heat and density in your explanation). 2.Complete “Figure 3” on the bottom of page 267 by placing the words in points A and B. Then, cut out and glue in your notebook. Part 2: Convection Currents in the Mantle