Shelly wants to find the speed that her dog can run. What should Shelly do? measure the distance the dog runs
measure the time the dog runs
measure the size of the dog and the distance it runs
measure the time it takes for the dog to run a certain distance

On a spring day, a middle-latitude city (about 40? north latitude) has a surface (sea-level) temperature of 10 ? c. if vertical soundings reveal a nearly constant environmental lapse rate of 6.5 ? c per kilometer and a temperature at the tropopause of –55 ? c, what is the height of the tropopause?