evidence: Right around Easter, plastic eggs are in every store you walk into. They are inexpensive and fun for students… wondering how to use them in your science classroom? I have a bunch in my classroom that I use each year for a genetics activity (more on that in a minute!) but there are a ton of ways to get use out of them year after year. Here are some science related ideas! [...] - LAYERS OF THE EARTH MODEL: If the plastic egg represents the crust, have students use clay to build the inner layers of the earth. They can use different colors to represent the inner core, outer core, and mantle. (Be sure to point out to students the earth is a sphere, not an oval to avoid any misconceptions).