Assume that our Moon is hit by 25 million tiny meteorites every day. On average, it takes about 20 such impacts to obliterate a footprint left by an Apollo astronaut on the surface of the Moon. About how long would you estimate that it would take to erase evidence of a single footprint

Which of the following statements best describes what is occurring in the land surrounding the sahara desert? a desertification is increasing, and the desert is expanding. b. fewer people are trying to farm in this semiarid region. c. the desert is shrinking with the increased use of irrigation. d. increased urbanization has resulted in decreased deforestation. select the best answer from the choices provided mark this and return save and exit next submit