These are the most frequently used words in this book.
age
ago
air
although
another
antarctica
arms
astronomers
atmosphere
atoms
between
called
came
carbon
cent
century
changes
climate
clouds
come
conditions
cooling
cosmic
count
data
different
dioxide
down
during
early
earth
effect
even
events
evidence
experiment
far
few
field
first
found
galaxy
gas
global
high
ice
large
levels
life
little
long
low
magnetic
may
might
milky
million
molecules
new
now
ocean
part
particles
past
per
period
planet
rays
research
results
satellite
science
scientists
sea
should
show
since
sky
small
solar
space
specks
spiral
stars
still
sun
supernova
surface
svensmark
team
temperatures
time
university
variations
warm
warming
water
wind
world
years