Are you the curious type? Take a look at photos and descriptions of minerals, igneous, sedimentary, and metamorphic rocks at Volcano World's Rock and Mineral slide show.
Perhaps this little "rock" song will help you remember the differences among sedimentary, igneous, and metamorphic rocks. Sing it to the tune of "Row, Row, Row Your Boat."
Sedimentary rock has been formed in layers
Often found near water sources with fossils from 'decayers.'
Then there's igneous rock, here since earth was born.
Molten lava cooled and hardened that's how it is formed.
These two types of rock can also be transformed
With pressure heat and chemicals met - a - morphic they become.