Warm air lifted over a cold air mass will produce which front of the following below?

a) warm front
b) stationary front
c) occluded front
d) cold front

Transportation is the largest single source of air pollution in the united states. air pollution can harm the environment and human health. which technology could offer a solution to this problem? mufflers that reduce noise motors that run on electricity tires that improve gas mileage

Iron (3) oxide will decompose in the presence of hydrogen gas and heater to produced iron and digydrogen monoxide white a balanced chemical equation

At stp, which substance is the best conductor of electricity? a. nitrogen b. neon c. sulfur d. silver