What are the two types of energy sources?
a. fission and fusion
b. organic and inorganic
c. extrusive and intrusive
d. renewable and nonrenewable user: what is not a form of renewable energy?
a. wind power
b. solar energy
c. electric power
d. geothermal energy

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The covers all of earth like a thin shell,but it is not a solid sheet of material.it is broken up into several large sections and many smaller ones. fill in the blank.

Which revelation resulted from the observation of the spectrum of different galaxies? a. there were more galaxies whose spectrum was blueshifted b. there were no galaxies whose spectrum was redshifted c. there were more galaxies whose spectrum was redshifted d. there were no galaxies whose spectrum was blueshifted