hillside
加入词篮valley
canyon
steep
ridge
mount
outback
plain
vast
flat
basin
low
lake
pond
pool
stream
river
deposit
pile
fill
accumulate
zone
Antarctic
Arctic
altitude
vertical
level
rock
rigid
tough
hard
marble
mineral
fossil
coal
iceberg
volcano
erupt
earthquake
map
chart
spring
well
spring
astronomy
astronomer
universe
universal
planet
Jupiter
earth
Mars
star
galaxy
satellite
rocket
moon
moonlight
sun
solar
space
spacecraft
spaceship
space station
airspace
astronaut
Cancer
orbit
revolution
chemistry
chemist
chemical
biochemistry
acid
agent
radium
metal
aluminum
aluminium
tin
thin
thinner
concentrate
aluminum
dioxide
react
gas
air
sky
carbon
oxygen
hydrogen
mix
mixture
physics
physicist
physical
