The waters of the Earth system constitute the:

Only temperature and salinity have an effect on the speed of sound

Indicate whether the statement is true or false

Portland, Oregon, is a U.S. city that has taken major steps toward a more livable and sustainable urban experience, including

A) curtailing automobile use and creating an urban development boundary surrounding the city. B) banning automobiles within the city limits and providing bicycles to residents. C) razing its slums and replacing them with upscale apartments and shopping centers. D) relaxing air quality standards to encourage inner city industry.

Linguistically, Africa is fairly simple, with only 5-10 major languages spoken across the continent

a. True b. False Indicate whether the statement is true or false

Sedimentary layers can be important indicators of past environmental conditions that existed when the sediments were deposited.

Indicate whether the statement is true or false