How do carbon dioxide and oxygen levels in the oceans compare to those in the air

Which statement about portugal is not true? a. it granted independence to its last colony in 1975 b. it has avoided conflict with spain c. it was a leader in european world exploration in the 1400s d. its economy is changing from agricultural to industrial b. it has avoided conflict with spain

Which of teh following would explain the importance of the trans-siberian railroad to russia's economy? (schoology test)

At which boundary does subduction stop occurring, resulting in a mountain range?