G8 U7

Too much use of electric lights in cities may cause _______.

When radiation goes into the land, air or water, it is called _______.

_______ occurs when the atmosphere contains gases, dust, or fumes in harmful amounts

historical

to think of an idea, or a plan

_______ occurs because there are too many loud sounds in the environment.

growing or living in, on, or near water

no longer alive

When _______ happens, the water temperature in streams, rivers, lakes, or oceans changes.

artistic

physical

The sight of too many telephone poles, advertising billboards, overhead power lines, or shop signs may cause _______.

made unclean or unsafe to use

botanic

throwing away something you do not want, especially in a place which is not allowed

logical

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

_______ is the contamination of lakes, rivers, oceans, or groundwater, usually by human activities.