Match the following. 1. systematic mass killing of a group of people.2. narrow, deep valley between mountains.3. energy produced through the movement of water.4. having extreme pride in a specific country.5. deep valley caused by the runoff of water.

What are seismic dampers and why are they important?

What is the mercury length of time for one revolution around the sun?

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.