The Earth can be divided into four hemispheres. Choose the respective dividing lines for each of the two sets: Northern and Southern Hemispheres versus Eastern and Western Hemispheres. A) Prime Meridian, Equator Major B) Equator, Greenwich Meridian C) Equator, Prime Meridian D) Prime Equator, Prime Meridian

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.

1. crust 1 the metallic layer at the earth's center 2. inner core 3 the firm layer between the crust and the asthenosphere 3. lower mantle 2 the layer surrounding the inner core 4. asthenosphere 4 the semi-solid layer between the top layer and the upper mantle 5. upper mantle 5 the layer between the asthenosphere and lower mantle 6. top layer 6 the earth's outermost layer 7. outer core 7 the hottest part of the mantle

What is the border between layers a through f and layer g called?