Science Rocks!

So here's a bit of geology you may find interesting. These rocks are arranged in pairs, with their partners above/below. Each set of partners have exactly the same chemical composition (dissolved minerals). So why do they look so different? Here's what's going on... The rocks on the bottom are extrusive rocks. They cooled quickly outside the volcano. Because they cooled quickly, their crystals are tiny and therefore look more uniform in color. The top row of rocks are intrusive rocks. They cooled very slowly in the volcano. Their crystals had longer to forms, so they are bigger. So in theory, if you melted the top row of rocks and cooled them quickly, they would look like the bottom row. If you melted the bottom row and cooled them slowly, they would look like the top row. Here are the names of these rocks: Left top - Gabbro, left bottom - basalt, middle top - Diorite, middle bottom - andesite, right top - granite, right bottom - rhyolite. Doesn't science rock?!?!