Experiment: Click Return to original settings. Using the Gizmo, test the effect of precipitation on the rate of weathering by measuring the amount of weathered sandstone in 20,000 years with low and high precipitation. Be sure to keep all the other variables the same. Describe your results below.

Which explanation describes the forces involved for a person to walk down the sidewalk? a. the person's feet push backward on the sidewalk; the sidewalk pushes backward on the person. b. the person's feet push forward on the sidewalk; the sidewalk does not push on the person. c. the person's feet push backward on the sidewalk; the sidewalk pushes forward on the person. d. the person's feet push forward on the sidewalk; the sidewalk pushes forward on the person.

In a voltaic cell, electrons flow from the (positive/negative) to the (positive/negative) terminal.

Which graph represents motion with an object with positive velocity that is located at a position of 3 meters at a time of 0 seconds? a) a b) bb eliminate c) c d) d