Water Pollution

The fresh water we use comes mainly from lakes and rivers and from a relatively narrow zone

• stored in the local county office.
• beneath the Earth's surface.
• comes from springs.
• stored in the community water tower.

The oceans are an important part of the water cycle because

• almost all of the Earth's water is in the oceans.
• almost all of the Earth's fresh water is in the oceans.
• almost all of the Earth's water is nin the glaciers.
• almost all the Earth's salt water is in the rivers.

A method of providing plants with water from sources other than precipitation is known as

• agriculture.
• water conversion.
• aquaducts.
• irrigation.

A leaking oil tanker is a 

• pathogen
• nonpoint source pollution
• point source pollution
• microbial bloom

The amount of space between particles that make up a rock determines a rock's

• porosity.
• eutrophication.
• algae content.
• seepage.

____________________ and ______________ decrease the amount of oxygen in the water.

• algae population and salt content
• eutrophication and thermal pollution
• salt content and thermal pollution
• eutrophication and salt content

Many areas of the world without adequate fresh water have become habitable because of 

• water treatment plants.
• irrigation.
• industrial processing.
• water management projects.

A process by which nutrients increase in a lake while oxygen levels decrease as a result of human activity is known as

• eutrophication.
• irrigation.
• point pollution.
• aeration.

During water treatment that adds the alum is called 

• aeration
• filtration
• coagulation.
• chlorination.

Water treatment also removes __________________, which are organisms that cause illness or disease.

• potable
• protista
• pesiforms
• pathogens