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tundra
treeless plain where only grasses and mosses grow
prairie
flat or rolling land covered with grass
canyon
deep valley with very high steep sides`
glacier
a large mass of ice
economy
the way a country's people use natural resources, money and knowledge to produce goods and services
megalopolis
large urban area formed by large cities
tributary
river or stream that flows into a larger river
wetland
low, flat area covered with water
renewable resource
material found in nature that can be replaced, such as forests
irrigation
a method of supplying dry land with water through a system of ditches and pipes
Continental Divide
Imaginary line made of high points in the Rockies from where our nation's rivers flow east or west.
hydroelectric power
electricity made from flowing water in rivers
scarcity
shortage of available goods and services
current
water or air that flows usually in the same path
drought
a long period with little or no rainfall
precipitation
moisture that falls to the ground in the form of rain, sleet or snow.
arid
dry
tornado
a powerful windstorm with a funnel shaped cloud
hurricane
cyclonic wind storm with strong winds and rain, over the ocean and on to land.
blizzard
heavy snowstorm with strong winds
plate tectonics
theory that Earth's surface is made up of plates and is contantly moving
global warming
the gradual increase of Earth's temperature
levee
an earth wall that farmers build to keep water from overflowing on land
water table
underground water that is close to Earth's surface.
What was the name of the costliest and deadliest hurricane in the history of the United States and what city was affected most?
Hurricane Katrina/New Orleans