Phase Diagram question:

Substance X can be found in all three phases (liquid, gas, solid),
although it's liquid form should be found in the subsurface since the
pressure is higher (but the temperature range is the same).


#11:
The crater is 300 meters across, so it should be 30 meters deep (10:1
ratio).  Since sample G was found at the rim, it came from the deepest
part of the crater, 30 meters deep.

#12:
Samples A and B should be from the surface, where the youngest rocks
are found.  Therefore they should be young basalt rocks instead of old
highland rocks.

#13:
There were two lava flows in this area, one 100 million years ago and
another 200 million years ago.  



#1 (on back)
(1/18)/(2/3)^2 = 1/8
The gravity is 1/8th as much as on Earth. (Should be able to do
without calculator)

#2:
It is mostly rock, with a very tiny bit of iron (pushing the planet's
density a little over 3 g/cc).

#3:
It is mostly uniform, with a tiny iron core (pushing the moment of
Inertia factor a little below 0.4).

#4:
It is the same distance from the sun as Earth, so the temperature is the
same, but the gravity is much less than Earth's.  Therefore the
escape velocity will be less, making it easier for gases to escape.

#6:
We should ignore the left-most points because the only reason they are
low is because the atmosphere stopped the meteorites from hitting the
sirface.  So the surface is not necessarily younger, it was just
shielded from the small impacts.  The age should be based on the
right-most points.