Water Usage in Arid Regions – Phoenix, AZ. Follow the feature highlighted by the Problem 14 placemark to the west (continue across the tunnels/pipelines that look like gaps). Where does it ultimately originate (the Problem 15 placemarks highlight the ends of a long tunnel)? Choose one: Colorado River Pacific Ocean a glacier in the Sierra Nevada Gulf of California

Ozone in the upper atmosphere has been depleted by a. sulfur dioxide. b. chlorofluorocarbons. c. carbon dioxide. d. oxygen.

Which statements describe sustainable development? multiple answer choice -fishing does not remove more fish from water systems than can be replaced by the number of fish that will be born to replace them. -sustainable development is development that is designed to improve the economic conditions in less-developed countries. -sustainable development is mainly a regional issue. -sustainable development means water is used at a rate that won't reduce the amount available for future use. - sustainable development policies only need to be concerned with environmental protection. - trees cannot be cut down faster than the number that will be replaced by new growth.

The magnitude of an earthquake is typically calculated according to the scale.           a. mercalli   b. fujita   c. richter   d. saffir-simpson