Why are deserts often sparsely populated? a. humans do not consider deserts attractive landscapes. b. a lack of rain makes growing crops and finding sources of drinking water difficult. c. the sandy and rocky quality of deserts makes construction efforts difficult. d. deserts often do not have valuable natural resources like gold or oil.

I would have to say the answer is B. A lack of rain makes growing crops and finding sources of drinking water difficult.

Historically speaking people would settle where they could farm easily, so they often picked fertile lands. Deserts are not fertile, so you won't see very many people there.

mercury

explanation:

mercury is the least dense because of its size