Environment

Choose the best answer:

rubbish carelessly dropped or left about (especially in public places)

a volatile flammable mixture of hydrocarbons (hexane and heptane and octane etc.) derived from petroleum; used mainly as a fuel in internal-combustion engines

undesirable state of the natural environment being contaminated with harmful substances as a consequence of human activities

the relationships between the air, land, water, animals, plants, etc., usually of a particular area, or the scientific study of this

the aggregation of things (pedestrians or vehicles) coming and going in a particular locality during a specified period of time

 to harm or spoil something

a substance that can make people or animals ill or kill them if they eat or drink it

to disappear or stop being present or existing, especially in asudden, surprising way

the act of removing harmful substances from something

things such as minerals, forests, coal, etc. that exist in a placeand can be used by people

the air, water, and land in or on which people, animals, andplants live

the grey, black, or white mixture ofgas and very small pieces of carbonthat is produced when somethingburns