Air pollution is a major health problem caused by the burning of fuels in a. vehicles.
b. power plants and factories.
c. home furnaces.
d. All of the above

Is snow a type of precipitation? explain why or why not.

Which best describes the nucleus of an atom a. it is where all of the particle s of the atom are located b. it is the negatively charged part of the atom c. it is where the electrons and the protons are located d. it is the part of the atom with the greatest mass

Which prefix mean under less or below