Show:
Surface Water
River Systems
Watersheds
Groundwater
100
Surface Water
Where is fresh water found on earth's land surface?
100
by falling rain which becomes streams, which then become rivers
How are rivers formed?
100
watershed
What is the area of land that is drained by a river?
100
Underground
Where does most of humans fresh water exist?
200
Near reliable sources of fresh surface water.
Where have people built towns throughout history?
200
The more streams that create the river the larger the river becomes
What is one reason that decides how big a river is?
200
Pollution anywhere in a watershed
What can be the cause of the pollution in a watershed?
200
From rainfall
Where does most ground water come from?
300
Drinking water, water to grow crops, food such as fish and shellfish, power for industry, and a means of transportation by boat.
What are some of the things rivers and streams provide?
300
A river system
What is a flowing network of rivers and streams called that move across the world?
300
Rapidly melting snow as well as sring and summer rains
What can cause the amount of water that enters a watershed varie
300
The water table
What is the level in the fround where the rocks and sediments are saturated with water?
400
near rivers
Where are some of the oldest cities in the world near?
400
The roots of a tree trunk
What does a river system look like from above?
400
Reduced to a trickle
What can sometimes happen to a river system that drains a watershed?
400
when the water table is at earth's surface
When will a spring of fresh water flow out onto the ground?
500
Lakes, rivers, streams, and wetlands
Where is surface water found?
500
The amazon river system
What is the largest river system in the world
500
Communities that depend on river for water
Who can a watershed being reduced to a trickle affect?
500
In valley and mountains
Where can water levels vary?