1) if a star's temperature were doubled, its new luminosity would be the original luminosity.
a) 32
b) 8
c) 16
d) 2
2) the source of fuel used to make the sun shine is
a) uranium
b) oil
c) hydrogen
d) coal

Impressions of tropical swamp plants were observed on rocks in polar regions. the impressions were dark black imprints, which means the fossils are examples of ( 1 ) the fossils tell us that polar regions ( 2 ) ( 1 ) a. carbonization b. mineralization c. trace fossils ( 2 ) a. had tropical plants that can grow in ice b. might have had a diffierent climate in the past c. will have abundent vegitation

Match the letters with the correct terms

Political boundaries are determined by the political party in control at the time. true or false