Question

According to "NASA confirms evidence that liquid water flows on today’s Mars," what must be present for liquid water to form on Mars?

a) Recurring slope lineae (RSL), because they are pathways for water flow
b) Hydrated salts, because they lower the freezing point of a liquid brine
c) Temperatures below minus 10 degrees Fahrenheit, because it is the point at which water freezes
d) Deserts, because perchlorates are most often found in dry areas

Answer 1

Hydrated salts lower the freezing point of water and allow it to exist in liquid form on the Martian surface.

Step-by-step explanation:

According to the article 'NASA confirms evidence that liquid water flows on today’s Mars,' hydrated salts must be present for liquid water to form on Mars.

Hydrated salts lower the freezing point of a liquid brine, allowing it to exist in liquid form on the Martian surface.

Salty water on Mars can occasionally flow as liquid under the right conditions.