students are asked to create roller coasters for marbles. their goal is to design a coaster with the tallest possible hill that a marble released from a height of 1.5 m (meters) can clear. the marbles will experience some air resistance and friction as they move.

The smokey mountains have over 2,100 miles of rushing mountain streams and rivers that flow through the park. in each mile lives a diverse community of native fish, amphibians, insects, and larvae, some of which are found only in the southern appalachians. park managers and scientific researchers test many factors such as fish populations, the watersheds and water tests to determine a) too many lizards are present b) the water quality of the stream c) rainwater is running into local streams d) if visitors to the park are overstaying their welcome