Today students learned about three different kids of rock: sedimentary, metamorphic, and igneous.  We also learned about the Earth’s layers.

We took slices of bread, compressed them with books, and saw how the slices turned into a solid block, with visible layers.  This represented sedimentary rock.  We then took 3 different colors of Laffy Taffy, and using the heat and pressure from hands, turned the 3 “rocks” into one metamorphic “rock”.  We looked at how igneous rock is formed by seeing how “lava” i.e. Magic Shell ice cream topping, becomes igneous “rock” when the topping cools on ice.

We watched two short videos, one from “It’s OK to be Smart” about the Earth’s layers and formation, and another from Bill Nye about the rock cycle.  Students filled out a diagram about the Earth’s layers.

Some questions you could ask:

  • What was your favorite kind of rock (sedimentary, igneous, metamorphic), and why?
  • How does sedimentary rock form?
  • How does igneous rock form?
  • How does metamorphic rock form?
  • Why do geologists study rocks?  What do they hope to find out?
  • Do you remember what the Earth’s core is made out of?  Why is it so hot?