Question

one way in which mars closely resembles the earth is the length of its year (period of revolution). the make - up and thickness of its atmosphere. the length of its day (period of rotation). the surface gravity (i.e., what we would weigh there). its mass.

Explanation:

Mars has a rotation period (day - length) of about 24 hours and 37 minutes, which is very close to Earth's rotation period of approximately 24 hours. Earth's year (revolution period) is about 365 days, while Mars' year is about 687 Earth - days. Earth's atmosphere is mainly composed of nitrogen and oxygen with a significant greenhouse - gas component (carbon dioxide is a minor part but has a role in the greenhouse effect), while Mars' atmosphere is mostly carbon dioxide and is much thinner. Earth's surface gravity is \(g = 9.8\ m/s^{2}\), and Mars' surface gravity is about \(3.7\ m/s^{2}\). Earth's mass is \(M_{Earth}\approx5.97\times 10^{24}\ kg\), and Mars' mass is \(M_{Mars}\approx6.42\times 10^{23}\ kg\).

Answer:

the length of its day (period of rotation).