hydrosphere review

Why is water from an aquifer more likely to be cleaner than water from other sources?

• because if forms where fresh and salt water meet
• it receives water directly from precipitation
• it rises to the surface near the ocean
• pollutants are filtered by rock and soil deep within earth

what is an Estuary 

• an area that drains into a large river 
• a partly enclosed costal body of water that has atleast one river or stream feeding into it
• an area that drains into a smaller river or stream
• a wet land dominated by peat moss

Where is most of Earth's FRESHWATER found?

• Glaciers and snowcaps
• Groundwater
• Lakes and ponds
• Oceans

what is upwelling

• when warm water rises and brings nutrients to the top
• where cold water sinks and warm water rises and brings nutrients to the top
• when nutrients in cold water sink to the bottom
• the process where cold nutrient rich water rises while warm water sinks

Where is most freshwater located?

• in lakes
• on ice caps
• in groundwater

what is a mixture of fresh and salt water

• salinity
• brackish 

how does the ocean affect all living things

• provides a home for all aquatic life
• is a source of drinking water
• the ocean provides a place for many organisms to live 
• by providing nutrients needed to all animals

Which is true about most of the freshwater on Earth?

• it is abundant
• it is inaccessible
• it in underground
• it is in the atomosphere

Scientists have found strange new life-forms called “tubeworms” on the deep ocean bottom. Which most likely provides energy for the tubeworms?

• algae
• small fish
• photosynthesis
• hydrothermal vents

Approximately what percentage of the hydrosphere is represented by the oceans on Earth?

• 30%
• 70%
• 87%
• 97%