Day 126: Igneous Rock ID Lab »
By Mr. G on Mar 4, 2008 in Geology, Featured | 0 Comments
We had completed most of the Igneous Rock notes guide in class yesterday, but a few small details remained to be ironed out at the start of today’s class. This included the meaning of porphyritic: an igneous rock with two distinct crystal sizes. This type of rock forms from either several different cooling environments or […]