1. Human Impact on Water
Write on RIGHT side

2. Importance of Water -97% of Earth’s water is Salt Water
-Less than 1% is fresh liquid water
-Urbanization has caused a greater demand for water in a smaller area
-Water quality is the measure of the cleanliness of the water
-Water supply is how much water is available

3. Threats to Water Quality
-Water pollution is when waste or other material is added to the water and it becomes harmful to the organisms that use or live in it
-Point Source Pollution comes from one specific point
-Example: Major chemical or oil spill
-Nonpoint Source Pollution comes from many small sources
-More difficult to control
-Main Sources are city streets, roads, drains, farms, and mines

4. Types of Water Pollution
-Thermal Pollution is the heating of natural water by human activity
-Chemical Pollution is when harmful chemicals are added to the water
-Biological Pollution is when live or dead organisms are added to water supplies
-Eutrophication is the increase of nutrients in the water which happens naturally
-Artificial Eutrophication occurs when humans add nutrients to the water
-Fertilizer and Wastewater are the main causes
-Causes fast growing algae which reduces oxygen and kills fish and other organisms

6. Changing the Flow of Water
-Dams alter the flow of water causing flooding upstream and drying up the land below
-Aquifers often supply water to urban areas
-The water table drops when more water is taken than is naturally replaced
- This can cause rivers and streams to dry up

7. Reflection (Left Side)
Draw and color an example of water pollution that you knew LEAST about.
Label the type of pollution you drew.
Underneath your drawing, write a sentence describing your picture.
Biological Pollution
Animal waste can get washed into a water supply by runoff.