pH - A measure of acidity of a solution. It is expressed on a scale from 0-14 where 7 is neutral, lower numbers are acidic and higher numbers are basic. , water clarity - The level of light that penetrates through the water. , sediment - The solids that settle to the bottom of a liquid., Secchi disk - A tool used to measure the clarity of the water. , suburban - neighborhoods, parks, roads, rural - country/farmland, fewer people , salinity - the amount of salt in the water, point source pollution - we can track it back to where it came from , nonpoint source pollution - This is where most pollution comes from. The sources are difficult to identify. , invertebrate - an animal without a backbone, urban - city environment, lots of buildings, roads and sidewalks, watershed - the land area that drains surface water into a river or other body of water , biodiversity - the variety of plants and animal species in an environment ,

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