What is one problem with preventing erosion in the desert? a. there is too much wind. b. there is too much rain at one time. c. there are not enough plants to protect the soil. d. humans have altered the climate so significantly that desertification has increased.

An astronaut on the moon throws a baseball upward. the astronaut is 6 ft, 6 in. tall, and the initial velocity of the ball is 3030 ft per sec. the height s of the ball in feet is given by the equation s equals negative 2.7 t squared plus 30 t plus 6.5s=−2.7t2+30t+6.5, where t is the number of seconds after the ball was thrown. complete parts a and b.