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SCIENCE answer key week of Dec 8th
Relax! Take a deep breath! Count backwards from 10! Now
take your quiz!
1. Where is most of the fresh water on Earth found?
a) Under the ground
b) In rivers
c) In Oceans
d) Frozen in glaciers and ice caps
2. Which of the following describes what happens during a chemical reaction
between two compounds?
e) Some atoms are lost during the reaction
f) Atoms in the reactants rearrange to form particles with different properties.
g) A solid dissolves in a liquid
h) New atoms form during the reaction.
3. What fraction of the Earth’s surface is covered by the oceans?
a) About one-tenth
b) About one-fourth
c) About three-fourths
d) About one-half
4. Where is most water on Earth found?
i) Saline water in the oceans
j) Freshwater in lakes
k) Ice caps
l) groundwater
5. Salinity is a measure of how salty water is. (salinity, sea level)
6. Name two sources of fresh water.
1. groundwater
2. lakes
7. Name the three resources that come from the ocean:
a. Table salt, petroleum jelly
b. magnesium, jello
c. seafood, petroleum
8. Suppose that you are on a raft in the ocean near an area where a river flows into it.
Describe how the salinity of the water changes as you float away from the river.
The salinity will increase as you move away from the river because there is less fresh
water mixing in.
9. How is the water table related to an aquifer?
Water table is the top layer of the aquifer. The layer of rock and soil that groundwater
flows through is an aquifer.
10. How can scientist help us to use water wisely?
They can identify underground water sources and the quality of the sources and provide
technology to reduce the amount of water a community needs.