Couple Astronomy questions?

YA MON

New member
Can't find a couple answers so I'm gonna ask here.

-The fact that part of the earth's core is liquid comes from:
a) x-ray pictures taken with a powerful device in Russia
b) analysis of earthquake waves
c) samples obtained by drilling deep holes
d) analysis of the material erupted from volcanoes
e) both c and d



-How were the maria formed?
a) huge rocks crashed into the moon's surface; molten rock from its interior flooded the large basins that were formed
b) maria are just giant craters
c) maria are oceans on the moon's surface
d) they were formed by the huge tidal interaction between the earth and moon
e) all of the above

Thanks for any help.
 
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