The dark, seasonal markings on Mars that grow in the spring and fade in the autumn are believed to result from:
A)microbial activity in the soil (or regolith).
B)lighting effects that vary as the angle of the Sun changes with the seasons.
C)dust being blown by winds, alternately covering and uncovering dark rocks.
D)plant life.

Question

Quizplus · Accepted Answer

The dark, seasonal markings on Mars, known as "recurring slope lineae," are believed to result from dust being blown by winds, which alternately cover and uncover dark rocks or soil, rather than being caused by microbial activity, lighting effects, or plant life.

The Dark, Seasonal Markings on Mars That Grow in the Spring