Most of the mass of the solar system is contained in the
a. sun
b. comets
c. planets
d. asteroids

The blue segment below is a diameter of oo. what is the length of the radius of the circle?

Which of the following types of nonrenewable fuel sources requires the storage of radioactive waste? a. coal b. nuclear c. solar d. oil

What effect has the drug trade had on some governments in middle and south america? a. it has funded political instability. b. many nations have created democratic governments. c. many governments have allowed the drug trade to fund local programs. d. it has funded political stability.