**14 questions ~ 50 points**

2) electrical tape is rubber tape that is wrapped around bare electrical wires. the purpose of this tape is that

a)
rubber is a conductor and transfers electricity from the wire.

b)
rubber is an insulator and is used as a safety feature.

c)
the tape keeps multiple wires together.

d)
the tape keeps wire in place.

3)
erosion of the beach is normally a slow process. what is one factor involved in this erosion?

a)
animal motion

b)
changing tides

c)
emptying rivers

d)
building coral reefs

4)
scientists believe that perching birds originated on the continents of australia and antarctica. how would these scientists explain the discovery of ancient perching bird fossils in africa?

a)
at one time, the climate in earth was consistent throughout the planet.

b)
the fossils may have been moved by man, animals, or earth’s constructive and destructive processes.

c)
the birds originated in africa, but migrated with human populations to australia and antarctica to africa.

d)
during the life of pangea, antarctica, australia and africa were neighboring continents with similar climates.

5)
there are islands in the ocean that are growing larger. the hawaiian islands are good examples of this. the reason that the islands were formed and are still growing is

a)
they were produced by drought.

b)
they were produced by volcanoes.

c)
they were produced by hurricanes.

d)
they were produced by earthquakes.

6)
what is the purpose of dna?

a)
manufactures proteins

b)
reduces activation energy

c)
stores hereditary information

d)
to aid in facilitated diffusion

7)
magnets and electromagnets can both be used to pick up metal items like iron nails.

even though they are similar, there are differences between magnets and electromagnets.

an example of one of these differences is that

a)
a magnet will pick up items that can't be picked up by an electromagnet.

b)
an electromagnet will pick up items that can't be picked up by an magnet.

c)
electromagnets have a set strength, while the strength of a magnet can be adjusted.

d)
magnets have a set strength, while the strength of an electromagnet can be adjusted.

8)
sandbags are piled along the banks of the rising flint river to form a

a)
temporary dam.

b)
permanent dam.

c)
temporary levee.

d)
permanent levee.

9)

flatworms
crabs
starfish

these may all be classified as

a)
crustaceans.

b)
invertebrates.

c)
predators.

d)
vertebrates.

10)
guardia is a parasite commonly found in lakes, creeks, and streams that can cause severe intestinal distress. what is usually the source of this microorganism?

a)
urine

b)
algae

c)
human feces

d)
animal feces

11)

mrs. thompson's third grade class is investigating bar magnets. mrs. thompson asks her students to correctly arrange the magnets so that they will repel each other. which picture shows how the students should have correctly arranged the bar magents?

a)

b)

c)

d)

12)

what does ice become when it absorbs enough heat energy?

a)
gas

b)
dew

c)
frost

d)
liquid

13)
mr. smith challenged his students to create an electromagnet that will pick up more paper clips than anyone else in the class. timmy is very excited and begins to collect all of the necessary materials. he finds a d-cell battery, an iron nail, and a large roll of copper wire. what could timmy do, using just these materials, to increase the strength of his electromagnet to pick up the maximum amount of paper clips?

a)
cut the iron nail in half to use as the core

b)
only attach the battery to one end of the nail

c)
increase the number of coils of copper he puts around the nail

d)
decrease the number of coils of copper wire he puts around the nail

14)

ben and sam were conducting experiments on physical and chemical changes in science class. first they added some salt to water and stirred it up until the salt dissolved. "that's a physical change" ben said. "and that's a solution which is a mixture", added sam. next they added an anti-acid tablet to some water. the water began to fizz and bubble. the beaker got cooler. "that's a physical change too," ben noted. "no, it's not," responded sam. who is correct and where should the contents of the beaker be placed in the venn diagram?

a)
sam is correct. it is not a physical change and it should be placed in a.

b)
sam is correct. it is a chemical change and the contents should be in d. for compound.

c)
ben is correct. it is a physical change and it is a solution, placing it in b. as a mixture.

d)
they are both correct. it is a mixture and a compound and the contents should be placed in c.

15)

gravity can cause hillsides to crumble and fall. new landforms develop at the bottoms of mountains and hills. what causes this new landform?

a)
earthquake

b)
faulting

c)
landslide

d)
volcano