Environmental Science Crossword

Any natural substance that humans use
The layer around the Earth in which life occurs naturally, extending from about 8 km above the Earth to the deepest part of the ocean
All living organisms in a certain area as well as their physical environment
A group of interacting populations of different species
Condition in which the air contains substances harmful to living things
Air pollution over urban areas that reduces visibility which is a combination of smoke and fog
Illegal hunting
Organism that lives in or on another organism and feeds on it without immediately killing it
Entire area of land that is drained by a river
Any discarded material that is not a liquid or a gas
Consumer that gets its food by breaking down dead organisms, causing them to rot
Underground rock formation that contains water
The average weather in an area over a long period of time
Term used to indicate the number and diversity of species on Earth
The irreversible disappearance of a population or a species
Thin layer of gases that surrounds the Earth
Pollutant put directly into the air by human activity
Water that contains toxic chemicals dissolved from wastes in a landfill
Waste-disposal facility where wastes are out in the ground and covered each day with a layer of dirt, plastic, or both
Pollutants that forms when a primary pollutant or a naturally occurring substance comes into contact with another primary pollutant