Tuesday, August 10, 2010
Mining: Cupcake Core Samples
Straws, cut in half
Brainstorm ideas for finding out what’s under the earth’s surface without digging.
Demonstrate core sampling with layers of clay and the apple corer.
Each student will get a cupcake and a straw to do some core sampling.
Students use the straws to “drill” in three spots across the middle of the cupcake (the holes need to be made in a line across the cupcake, not a triangle). After the sample’s been drilled, gently blow the sample out of the straw.
Students draw their observations of each sample. (By the way, I've never had the core samples fall apart as badly as they did this time - the cupcakes didn't sit for as long as they usually do and I think that made the difference).
After taking and recording three samples, students make a hypothesis about what the cross-section of the cupcake looks like.
Students use a plastic knife to cut through the cupcake (through the 3 holes) to view the cross-section.
Students draw their observations before eating the evidence.
Compare evidence with hypothesis.
Thoughts on the lab.