<span>Water on Mars exists today almost entirely as ice, though it also exists in small quantities as vapor in the atmosphere and occasionally as low-volume liquid brines in shallow Martian soil. The only place where water ice is visible at the surface is at the north polar ice cap.</span>
Answer: I believe it is mudflows
Explanation:
<span>Depending on the class that your letter went, it could take two days or one week. Traditionally, first class mail almost the next day.</span>
