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Earth Science Midterm Review
Test Description: Practice Questions for the 8th grade Earth Science Midterm
Instructions: Answer all questions to get your test result.
1) What is the first step in soil formation?
A
none of these
B
parent rock is weathered into smaller pieces
C
humus is created
D
water and wind deposit sand to form dunes
2) How does cooling time effect grain size in igneous rocks?
A
the faster the rock cools the larger the grain size
B
the faster the rock cools the smaller the grain size
C
the cooling rate does not effect grain size
D
only sedimentary rocks cool to form grains, not igneous rocks
3) Clastic sedimentary rocks form how?
A
contact metamorphism
B
regional metamorphism
C
time and pressure causes compaction and cementation
D
rock forming chemicals are left after water evaporates
4) How do igneous rocks form?
A
sediments are deposited and over time compressed and cemented together
B
a rock undergoes a change in pressure or heating and forms another rock
C
as magma or lava cools and hardens
D
over a large area as rocks are exposed to the extreme pressure of mountian building.
5) What type of rocks can become metamophic rocks?
A
only special minerals can become metamorphic rocks.
B
only sedimentary rocks
C
all three types (sedimentary, igneous,and metamorphic) can become metamorphic rocks
D
both sedimentary and igneous rocks
6) Which of the following is a mineral?
A
Coal
B
limestone
C
Gold
D
Granite
7) A mineral's colored powder is found by scratching it on a plate, what is this mineral property called?
A
cleavage
B
streak
C
color
D
luster
8) Which type of rocks can contain fossils?
A
extrusive igneous rocks
B
organic sedimentary rocks
C
intrusive igneous rocks
D
minerals
9) Limestone is classified as both a chemical sedimentary rock and as an organic sedimentary rock, Why?
A
because is is formed by both a chemical process (evaporation of disolved minerals) and contains organic material
B
because it forms when it errupts from the earth and cools instantly
C
because it is used to make drywall
D
because of the mineral it contains
10) What is weathering?
A
When material is carried from one place to another by water
B
compaction and cementation of rock material
C
When material is carried from one place to another by the wind
D
when rock material is disintegrated and decomposed
*select an answer for all questions
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