Hydrosphere 1

Which is most likely an example of point source pollution?

• fertilizer sprayed onto a field
• water runoff from a city street 
• a pipe flowing into a river

Which describes an estuary?

• A large body of fresh water.
• A large body of salt water.
• The wide, lower course of a river where fresh and salt water mix.

Where does most fresh water exist?

• ice caps, lakes, and streams
• glaciers, rivers, and oceans
• aquifers, ice caps, and glaciers

An area of land that drains into a body of water.

• mouth
• point-source pollution
• watershed
• headwaters

The change of water from a liquid to a gas.

• evaporation
• precipitation
• condensation
• transpiration

How much of the earth's water is freshwater?

• 50 %
• 3 %
• 97 %
• 93 %

Which human activity can speed up the process of eutrophication?

• Building cities
• Nuclear power plants
• Deforestation
• Farming

What is Point-Source pollution? 

• pollution coming from a specific one site
• unsure of the places the pollution is coming from 
• Oil spills in to the ocean
• None of the above

Eutrophication 

• The environment around an ocean becomes contaminated 
• When an animal has a high level of pollution inside it
• When the ocean is polluted 
• The enrichment of an ecosystem with chemical nutrients

How much of Earth's water is unavailable for humans to consume due to its high salinity? 

• 3%
• 23%
• 77%
• 97%