Search Results
Showing results 21 to 24 of 24
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-002-866.jpg?itok=aeniFI_r)
The Thousand-Yard Model
Source Institutions
This is a classic exercise for visualizing the scale of the Solar System.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-003-384.jpg?itok=W1JoJnR0)
Cook Food Using the Sun
Source Institutions
Learners build a solar oven from a cardboard pizza box, aluminum foil and plastic. Learners can use their oven to cook S'mores or other food in the sun.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-003-199.jpg?itok=BJeWanRW)
Disappearing Crystals
Source Institutions
Learners experiment with water gel crystals, or sodium polyacrylate crystals, which absorb hundreds of times their weight in water. When in pure water, the water gel crystals cannot be seen.
![](/sites/default/files/styles/square_100/public/resource_images/smile-000-000-001-953.gif?itok=PXODLPi7)
How Greenhouse Gases Absorb Heat
Source Institutions
Learners observe two model atmospheres -- one with normal atmospheric composition and another with an elevated concentration of carbon dioxide.