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8th Grade Science EOG Practice
Test Description: Students prepare for their 8th Grade Science EOG
Instructions: Answer all questions to get your test result.
1) Which source of water pollution includes oil and gasoline discharge from automobiles and storm sewer drainage?
A
bacteria
B
urban runoff
C
sedimentation
D
agriculture
2) Which best explains the importance of dissolved gases in the ocean?
A
They help maintain a constant water temperature.
B
They help provide oxygen for aquatic animals.
C
They help control pollution
D
They help maintain constant levels of salinity.
3) Which best describes a bioindicator?
A
a species that depends on specific conditions to survive
B
a species that has been introduced into an ecosystem
C
a species that can adapt to a variety of conditions
D
a species that has a short life span
4) How can the atmosphere be considered part of the hydrosphere?
A
It traps pollutants that would otherwise harm the earth
B
It is a source of water.
C
It contains the oxygen necessary for life on Earth.
D
It blocks ultraviolet rays from the sun.
5) What characteristic of aluminum allows it to be made into aluminum foil?
A
It is malleable.
B
It is dense.
C
It is magnetic.
D
It is soluble.
6) Which pure substance is composed of more than one element?
A
water
B
gold
C
carbon
D
sodium
7) Which factor best explains why some people will develop cancer and others will not after being exposed to the same high levels of a harmful chemical?
A
individual exposure to the chemical
B
potency of the chemical
C
individual susceptibility to the chemical
D
concentration of the chemical
8) Which is the best way to determine if an object is made of pure silver?
A
determine the density of the object and compare the known density of pure silver
B
compare the mass of the silver object to the mass of a piece of pure silver
C
test to see if the object is chemically reactive
D
determine the solubility of the object
9) A layer of marine fossils is discovered in a desert environment. Which hypothesis best explains the discovery?
A
A catastrophic event once occurred in the area.
B
Volcanic activity once occurred in the area.
C
Erosion turned most of the limestone in the area into sand.
D
The area was once covered by water.
10) Fossils of warm-weather plants were found on an island in the Arctic Ocean. What can best be concluded from this discovery?
A
Seeds of plants have been carried to the island by migratory birds.
B
Ocean currents carried the plants to the island.
C
The island drifted from a tropical region to its present location.
D
Spores of plants drifted by air currents to the island.
*select an answer for all questions
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