Editing Planetary Compositions (section)

== Demonstration ==

;Presentation (Stage):
# Set out the graduated cylinder and add 200mL of water to it. Explain to the audience that you want to see how much water can be displaced by different materials.
# Drop the denser objects into the cylinder: the rocks and minerals, marbles, ice cubes, and any ceramic or glass beads. Add enough of these to adjust the water level by 100mL. Point out that the water level rose as you added these things in to a visibly different level.
# Drop the less dense objects into the cylinder: plastic and wood beads, cotton balls, pom-poms, packing peanuts. Fill the cylinder to the top with the less dense objects, and point out that since these objects aren't nearly as dense, the water level didn't adjust much.
# Set the fan on one end of the table. Pour out the water from the cylinder and lay out all the objects in front of the fan in a pile. Turn the fan on high for 10-15 seconds, and note which objects moved/didn't move. Be sure to have the denser objects underneath the less dense objects, otherwise you might not see anything happen!
# Ask the audience the following: What are the planets closest to the sun mostly made of? What are the planets farther from the sun mostly made of? Does the density of the materials seem to affect where the materials are in the solar system?

;Presentation (Hands-on):
# Set out the graduated cylinder and add 200mL of water to it. Set out all the objects to drop into it, and have the planet density chart out as well. Set the fan on the far side of the table, aiming towards the center.
# As students come up, have them drop the various objects into the graduated cylinder to see how dense they are. Have them guess which planets would sink if they could be dropped in water, and which ones might float or sink slowly.
# Have the students set a variety of the objects in front of the fan. State that the fan will show the solar wind the sun has, and ask what they think will happen to the objects. Turn the fan on low or medium for 10-15 seconds, and note the results. Do the results seem similar to how the planets are arranged?