SCIENCE OF SMOG 1. The burning of which fuel is the main source of industrial smog?
A. Oil
B. Coal
C. Natural gas
D. Biomass

Which statement is a good description of a model? a) models are a description of nature based only on one or two variables. b) models are testable ideas but they are not very to most people. c) models are a description of nature that predicts more accurately than real events. d) models are an approximiation of a real system that omits all but most essential variables in a system.

What is your opinion about government shutdown?

Cyrus is volunteering on his aunt's campaign for state senator. she has asked him to write a speech informing people about the transportation reforms she will make, if elected. cyrus wants to coach his aunt in using speech techniques to make her ideas heard.