These are the most frequently used words in this book.
100
180
age
apollo
areas
astronauts
atlas
basalts
basin
between
billion
breccias
camera
cd
clementine
co
composition
crater
crust
data
day
different
during
early
earth
f0
far
fd
figure
first
found
fragments
global
high
highlands
history
image
impact
instrument
km
lac
lander
landing
large
latitude
lava
lo
luna
lunar
magma
map
mapping
mare
maria
material
may
mission
moon
near
oc
orbit
orbiter
oz
pictures
plate
pole
projection
ranger
regions
regolith
result
returned
rock
rt
samples
see
shows
side
site
slightly
small
soil
solar
south
spacecraft
sun
surface
surveyor
table
three
ti
time
two
type
usa
used
ussr
volcanic
volcanoes
years
