Water Quality Crossword

The kind of pollution which comes from a widespread area, not just a particular point.
The kind of pollution that can be traced to a single source, such as a factory discharge of contaminated water into a river.
Chemicals used to kill undesirable plant and animal pests. Some are toxic and can harm aquatic life when they wash into waterways.
A scale which measures the acidity or alkalinity of a substance on a scale from 0 to 14.
The area of land which drains into rivers and lakes; it may contain many smaller streams and creeks.
Particles of soil which, when eroded from their natural position, can clog up waterways and cause other problems; it may carry nutrients, pesticides and other chemicals from other sources.
Ecosystems that support animal and plant life along edges of waterways
The process by which water becomes enriched with nutrients; This process can be accelerated when excessive nutrients are present.
The detachment of soil particles caused by water, wind, or gravity
The process by which water is recycled by precipitation, evaporation, transpiration and condensation.
The part of precipitation that naturally flows off the land, sometimes it forms streams.
Water which has been used by people in homes, businesses, farms or factories; it carries soil and dissolved impurities.
An organism which lacks a spinal column or backbone and is 0.2-0.5 millimeters in size.