Answer: We study other star systems in spaceships and big, professional telescopes
Erosion needs Earths rock
Erosion is wearing down and carrying away rocks by wind and moving water, happens faster with steep hillsides and heavy rain
Nonrenewable resources either don't replenish themselves, or don't do so in a timely fashion that keeps up with our demand. Therefore, we need to cut our consumption to prolong the resources supply.
