Most of earth's freshwater is
a. in the ocean
b. in lakes and rivers
c. frozen in glaciers and ice caps
d. found underground

Wegeners theory of continental drift states that the continents have changed throughout history while the theory of plate tectonics

The declining axolotl population in mexico city is an example of in overcrowded cities. a. the surpassing of support capacity b. changes to natural environments and native species c. the lack of safe homes and tenured spaces d. the effects of a growing urban heat island

Which of these is a drawback of using natural gas? a. it is fairly safe for use in homes. b. it burns more cleanly than crude oil products. c. scientists have developed new ways of extracting it. d. during its extraction, groundwater can be contaminated.