Hydrosphere

What contains most of Earth's water? 

• Oceans
• River
• Lakes
• Snow

A rock layer that collects and stores water is called an ________.

• Watershed
• Aquifer
• Estuary
• Ocean Basin 

Which of these is NOT a threat to living ocean resources? 

• Overfishing 
• Evaporation
• Pollution
• Oil Spills 

What is the source of most of the salt in the ocean? 

• Fish 
• Sand 
• Rocks
• Dunes

An area of land that drains into a river or lake is called a _____.  

• Estuary 
• Stream 
• Aquifer 
• Watershed

A clear example of point-source pollution is 

• trash floating in ocean water
• feedlot wastes in a river 
• oil spilling from supertanker 
• salts from irrigation

What is the effects of high nutrient levels in water ?

• Pollution 
• Algal bloom 
• Cloudy water 
• Clear water 

The Clean Water Act sets water quality standards for ________.

• Surface Waters
• Ground Water
• Drinking Water 
• Ocean Waters

What are the indicators of healthy water ?

• Low temperature , Low oxygen , Low pH
• High temperature , High oxygen , High pH
• High temperature , Low oxygen , Neutral pH 
• Low temperature , High oxygen , Neutral pH 

What are the main producers in the ocean ? 

• Algae 
• Algae and other microscopic organisms 
• Zooplankton 
• Under water plants