Which country shares the northern border of the united states?
a. canada
b. mexico
c. greenland
d. alberta

Where is the only location in the united states where you drive on the left side of the road?

What happens to rock when acid reacts with it?

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