The author mentions outer space in line 7 because...

Câu hỏi: The author mentions outer space in line 7 because __________.

A the Earth’s climate millions of years ago was similar to conditions in outer space

B rock formations in outer space are similar to those found on the ocean floor

C it is similar to the ocean floor in being alien to the human environmentD.

D  techniques used by scientists to explore outer space were similar to those used in ocean exploration