What is the challenge California faces when hundreds and thousands of people move here?
What is providing water
100
What type of water is the easiest fresh water to obtain?
What is surface water
100
The surface of a layer of saturated ground is called what?
What is water table
100
The state has passed laws to people to save what?
What is water
100
Where does California's drinking water come from?
What is rivers
200
In your house, what involves the most water?
What is toilets
200
Even in places where fresh water is plentiful, what can damage the water supply?
What is population
200
What is a underground layer of rock or soil through which water easily moves?
What is aquifer
200
What is most of California's water used for?
What is farms
200
Where is the water from rivers, lakes, or reservoir treated or cleaned at?
What is purification plant
300
Only about one third of the rain falls in the Central Valley and where else?
What is southern California
300
How much percent is fresh water that humans and other living things need to survive?
What is 3
300
Water at the surface seeps downward until it reaches a layer of solid rock and what else?
What is tightly packed clay
300
Between 50 and what other number of percent of waste water from homes and offices can be used to water lawns or plants?
What is 75
300
In the process of cleaning water at the purification plant, what is the sand and gravel used for?
What is to filter out unwanted material
400
Much of the San Joaquin Valley and southern California receive lass than how much each year?
What is 10 inches of rainfall
400
How can groundwater be polluted?
What is by chemicals
400
The source of most groundwater is rain and what else?
What is melted snow
400
People often tap supplies of groundwater by drilling down what?
What is aquifers
400
Wastewater goes into a sewer system and pipes that carry the wastewater to where
What is sewage treatment plant
500
What is the average yearly rainfall and snow fall inn California?
What is 58 centimeters (23 inches)
500
How much percent does ground water make up of Earth's usable fresh water supply?
What is 94
500
People often tap supplies of groundwater by drilling down what?
What is aquifer
500
Most of the water that irrigates farms never reaches crops because it evaporates, runs off land and what else?
What is seeps into the soil
500
At the purification plant the water passes through a screen to remove insects, twigs, and and other large objects. Then chlorine and other chemicals is added to kill bacteria and what else?