Hello, I'm 12 years old and in seventh grade. I became interested in science through a program at the Childrens Museum of Indianapolis. I'm looking forward to your response and am thrilled that your website is avalable.
Stratification is one way that sedimentary rocks can form.
These rocks were formed in places where the deposition of silt was fairly constant over time. If there is a sudden shift in the environment, however, whether because the silt material changes, or the average temperature shifts, or so on, then the rock will form in distinct layers which we call strata. Shale is often a good rock for looking at strata. The vocabulary of geology is tricky. Copyright 1998-1999, Room103 group.