Which continent was once joined with greenland? how do you know?

Eastern europe’s population growth can be attributed to these factors. select all that apply migration

Which of the following is not a challenge to instituting sound global environmental policies? a. most changes are inexpensive and easy to implement. b. elected leaders who support unpopular environmental issues often are not re-elected. c. economic considerations outweigh environmental ones in many societies. d. there is no way to enforce international environmental agreements.

What is the approximate chemical composition of the solar nebula?