Sedimentary rocks are made of weathered pieces from other rocks.

Compare and contrast physical changes with chemical changes.

This drawing shows a human body system. what is the primary function of this body system?

Mike and mitchell decide to have a foot race. they mark off a stretch of 100 yards, and recruit cindy to work the stopwatch. after running the race and looking at the results, cindy declared that mitchell was the fastest. so how did the boys times compare?