1. Factors affecting water systems
Science 8 Hantsport School P. Warren

2. Temperature Over fishing Upwelling Pollution
Main Factors
Temperature
Over fishing
Upwelling
Pollution

3. Temperature
Average Earth temperature has increased due to emissions from carbon dioxide, methane, and water vapor (Greenhouse Gases—result of burning of fossil fuels)
Gases are trapped in the atmosphere
Climate change

4. Rise in Temperature Results
Melting of Polar Ice Caps in the North
Flooding—contamination of water
Drought in other areas
Drying up of lakes and streams
Affect fish, seals, polar bears

5. Over fishing
Fish population decreases to a dangerously low level as a result of humans and animals
One third of marine species’ population has decreased.
Increased technology has made over fishing easier—improved equipment and larger nets

6. Disruption of the food web
Over fishing Result
Disruption of the food web

7. Upwelling
Driven by wind, deep cold water is brought to the oceans surface decreasing water temperature.
Nutrient-rich water moves to the surface, where fish can use it for a food supply
Increased fish population—which is a great for the food web

8. Upwelling El Nino effect
El Nino (warm winds) disrupts upwelling and affects the food chain.
If there is no enough upwelling fish die or move to colder water in search of food supply
Creates hurricane environments due to increased warm air temperatures at surface of water.
Cause flooding

9. Water Pollution Anything that contaminates or makes something unclean
Water Pollution—sewage, animal wastes, industrial plants, oils, acids, dyes, pesticides, etc.
Fact—60 million gallons of oil enters the ocean each year.

10. Water Pollution Result
Pollution such as farm fertilizers increase algae bloom growth—use up oxygen also when dead in breaking them down
Pollution leads to oxygen depletion in our waters
Toxic chemicals give diseases to, and kill, marine species
Sediment can block the Sun—main component of photosynthesis