_____ rock, sediment, or soil through which groundwater moves easily

Nitrogen oxide concentrations are typically most pronounced in

A) large metropolises with heavy combustion of coal for power. B) large metropolises with heavy automobile use. C) rural areas experiencing the burning of forests. D) rural areas with heavy combustion of coal for power.

The chemical cycling principle of sustainability is driven by ____. 

A. primary producers B. detritivores C. decomposers D. the sun E. human activities

The latitude at which the sun is directly overhead is known as the sun's declination

Indicate whether the statement is true or false

Which of the following is a correct IUPAC name?

A) 1-methylpropanal B) 2-ethylpropanal C) 2,2-dimethylpropanal D) none of these