These are the most frequently used words in another edition of this book.
activity
age
american
annie
astronomer
astronomical
atmosphere
aurora
between
book
called
century
changes
chapman
china
climate
cold
connection
cycle
data
days
disturbances
douglass
due
during
early
earth
effects
energy
england
even
example
fact
field
fig
first
found
galileo
great
hemisphere
however
ibid
ice
known
later
light
lines
little
london
long
magnetic
maunder
may
minimum
nature
near
new
north
northern
note
noted
now
observations
observatory
others
part
particles
perhaps
period
pp
record
regions
research
royal
science
scientific
see
seen
show
since
society
solar
spots
still
storms
study
sun
sunspots
surface
temperature
time
tree
two
variations
vol
walter
weather
wind
work
years