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These are the most frequently used words in this book.
again
age
although
amount
another
arthur
atom
away
between
book
college
considered
date
dating
day
decay
doris
down
during
early
earth
elements
end
even
fact
few
field
finally
first
found
geological
geologists
geology
get
great
having
helium
himself
holmes
home
hundred
ideas
isotopes
kelvin
last
later
lead
left
letter
life
little
long
maggie
man
may
meteorites
method
million
minerals
months
mozambique
must
new
nier
now
oil
old
once
people
period
place
present
problem
professor
quite
radioactive
radioactivity
radium
rate
results
rocks
scale
science
should
since
still
students
theory
thousand
three
time
today
two
university
uranium
values
war
work
world
years
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