Today was a 40 minute class due to yesterday's Diversity day schedule.
We discussed briefly that one of the features of igneous rocks is their crystal size. We also said that if the rock cooled quickly--like lave falling into the ocean or bursting up on land--then the crystals did not have time to get very large. If the magma cooled slowly then the crystals did have time to grow larger before the rock solidified.
We followed this up with a lab--we dissolved Magnesium Sulfate into distilled water and then allowed crystals to form both rapidly and slowly. We will review our results during the next class.
Our homework was to read pages 33-36 and complete the three section review questions on page 36.
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