Substances such as gas, coal, and oil that were formed underground from plant and animal remains
Ground fuels
Pollution
Fossil fuels
Sewage
Poisonous or harmful when taken into the body
Bitter
Resource
Toxic
Groundwater
A brown or gray cloud of air over a city caused by air pollution
Fossil fuel
Dust
Rain
Smog
Something very useful or valuable
Recycle
Reserve
Resource
Refund
Damage caused to the environment by harmful substances or waste
Trash
Toxic
Pollution
Poisonous
To harm or break something
Sewage
Degree
Resource
Damage
Unable to be seen; not visible to the eye
Resource
Sightless
Invisible
Volume
Water that collects or flows beneath the earth's surface
Underwater
Water cycle
Pond water
Groundwater
A place where trash is buried and covered with soil
Groundwater
Landmine
Invisible
Landfill
To change used things into new materials that can be used again
Transfer
Recycle
Resource
Reclaim
A unit for measuring the loudness of sound
Decibel
December
Declare
Volume
Causing or capable of causing death or illness; toxic
Populous
Poisonous
Landfill
Damage
The level of sound produced; how loud something is
Quiet
Volume
Vole
Noisy
Dirty wastewater, especially from bathrooms
Resource
Sewage
Smog
Toxic
Lasting forever or for a very long time
Resource
Invisible
Precious
Permanent
To make something bad or harmful
Decibel
Contaminate
Landfill
Poisonous