What type of natural hazard is usually brought on by drought, combined with human and animal population pressure? a) deforestation b) desertification c) salinization d) sedimentation

Students design a model roller-coaster track. they place a rubber ball at the highest point on the track and let it go. the ball rolls along the track pulled only by the force of gravity. eventually, it comes to a stop. which change to the design will result in the ball moving the greatest distance?