Problem
A. Which is closer to you right now, the outside edge of the atmosphere (Kárman line) or the center of the Earth? (Look it up.) How many times closer?
B. A mountain stream is 30 km long, starting way up at 2000 m above sea level and ending at 700 m above sea level where it joins the main river.
a. What is the average slope of the stream bed? (To get the stream's slope, aka gradient, divide the vertical distance by the horizontal distance.