ES Lesson 10: Water Resources and Pollution

More than 97% of Earth's total water supply is found in

• ice sheets
• the oceans
• the atmosphere
• groundwater

The land that supplies water to a river system is called a

• divide.
• wetland.
• watershed.
• tributary.

Most fresh water on Earth is

• frozen
• liquid
• gas
• sludge

Most of the world's water is

• ground water
• salt water
• fresh water
• surface waer

An ______________________ is an underground formation that contains groundwater.

• aquifer
• point source pollution
• nonpoint source pollution
• potable

What is the single largest AVAILABLE source of freshwater to humans?

• Glaciers and sea ice
• Lakes and ponds
• Groundwater
• Rivers and Streams

Which of these applications makes up the largest proportion of human water consumption?

• Cooling of water for power plants.
• Mining
• Irrigation for agriculture
• Household and commercial use

In what situation does water stress occur?

• Naturally arid ecosystems
• Heavily populated countries
• Areas with intensive, highly-irrigated agriculture
• All of the above

Withdrawing water from an aquifer faster than it can be replenished results in

• A cone of depression
• Subsidence
• Saltwalter Intrusion
• All of the above

Mark all that are true of graywater

• a combination of black and white water
• relatively clean water form the sink, shower, laundry and dishwasher
• is drinkable water
• used to aid in flushing toilets, washing cars and garden irrigation