Why do beaches with larger rocks usually indicate the presence of high-energy waves? a) large rocks are formed only by tsunamis. b) low-energy waves carry only sand-like sediments. c) high-energy waves carry rock more quickly than low-energy waves. d) high-energy waves carry larger pieces of rock than low-energy waves.

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.

The chemical or mechanical process by which rock is gradually broken down eventually becoming soil

Which characteristics of temperature and salinity have the greatest influence on the movement of deep-ocean currentsa. warm and low salinityb. cold and high salinityc. cold and low salinityd. warm and high salinity