Mrs. Chiu's GeoSlueths took a cross section of a Snickers bar (aka--a bite!) to view the layers of a "rock." Using the Principle of Superposition (if you see a bunch of layers on top of each other, then the layer on the bottom is the oldest and the layer on the top is the youngest), we discovered that the chocolate layer would be the oldest. While examining the peanut and caramel layers, we uncovered the principle of inclusion (when pieces of one type of rock are inside a layer of another type of rock, then the pieces of the first type of rock will be older than the layer of rock that they are in).
Earlier in the week, students learned about the Principle of Original Horizontality (dirt and rock carried by water or wind is always deposited first in flat layers. So if you see layers of rock that have been folded or titled, then there must have been a something pushing or pulling these layers--maybe forces like earthquakes) through a demonstration with Miss Mally using towels that showed what forces, like earthquakes, can do to rocks.
Bet you didn't realize rocks could be so interesting!? Bet you didn't know that they hid such incredible stories about the past!? Well, Mrs. Chiu's detectives will be uncovering the many mysteries that the rocks in the Columbia River Gorge hide.
 |
| This is the best geology lesson I have ever tasted... |
 | |
| I wonder what happened to the other half?! |
 |
| Mmmm....look at those layers |
