86
222
aerated
air
breathing
cancer
carcinogen
cause
concept
cracked
cracks
crevices
danger
dangerous
death
decay
deterioration
diagnosis
dried
dry
earth
effects
environment
exposure
fissures
fixed
gas
ground
health
holes
idea
inhaling
issue
land
leaf
levels
lung
mitigation
natural rock
poisonous
polluted
pollution
preventable
prevention
problem
radiation
radioactive
radioactivity
radium
radon
reduce
risk
rn
safe
soil
testing
uranium
ventilated
water
wellbeing