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7-2 Water on the Surface
Chapter 7 Section 2
15
Science
02/08/2009

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Term
smaller streams and river that feed into a main river are called ___________
Definition
tributaries
Term
a river system is ________
Definition
a river and all its tributaries together
Term
a water shed is _________
Definition
the land area that supplies water to a river system
Term
a divide is ________
Definition
a ridege that separates one watershed from another
Term
when does a flood occur?
Definition
a flood occurs when the volume of the water increases so much it overflows its channels
Term
how can dams help control floods?
Definition
dams can help by redirecting or storing excess water
Term
long ridges of sediment along side the channel of a river are called _______
Definition
levees
Term
a pond is similar to a lake because they both have _______ water
Definition
pond is similar to a lake because they both have standing water
Term
lakes are ________ than ponds
Definition
lakes are larger and deeper than ponds
Term
Plants grow throughout a POND because ___________
Definition
pond water is shallow and sunlight reaches the bottom
Term
Name 3 ways people can use lakes
Definition
1. drinking water 2. agriculture 3. recreation
Term
a lake that stores water for human use is called ___________
Definition
a reserve
Term
lake turnover occurs in ___________ (where and what is the temperature)
Definition
cool northern areas of North America
Term
true or false
Lake turnover happens EACH year and causes nutrients from the bottom of the lake to rise to the top
Definition
true
Term
Large chunks that break off glaciers and float away in the ocean are called ___________
Definition
icebergs