AnswersSS4 PGCPS EARTH SPACE OC SUMMER 2027 - 794243Lab: Mineral and Rock Classification

Lab: Mineral and Rock Classification — Unit test Answers

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1
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Which statement is an example of an observation a scientist would make to classify a rock?

A
A rock is larger than other rocks.
B
A rock was found in a stream.
C
A rock is formed from molten lava.
D
A rock cracks in half after a rainstorm.
2
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Which phrase best describes igneous rocks?

A
form when lava and magma cool
B
accumulate sediments following erosion
C
require heat and pressure to be formed
D
consist of many sediment layers
3

What is the relationship between the rate at which molten material cools and a mineral's crystals?

A
The faster the cooling, the larger the crystals.
B
The slower the cooling, the larger the crystals.
C
The rate at which molten material cools does not affect crystal shape.
D
The rate at which molten material cools does not affect crystal size.
4

What is magma?

A
solid rock with a fine texture
B
cooled rock with large crystals
C
molten rock below Earth’s surface
D
flowing rock above Earth’s surface
7

Which is one source of the sediments that form sedimentary rocks?

A
chunks of coal
B
particles in new rocks
C
liquid magma
D
materials dissolved in solutions
8

Which correctly lists three characteristics of minerals?

A
solid, crystal structure, definite chemical composition
B
organic, crystal structure, definite chemical composition
C
human-made, solid, organic
D
crystal structure, definite chemical composition, human-made
9

Where are extrusive igneous rocks typically found?

A
in a canyon
B
in a riverbed
C
near a dormant volcano
D
deep under Earth’s surface
10

Which process forms sedimentary rock in the rock cycle after sediments accumulate and combine?

A
Sediments undergo heat and pressure.
B
Sedimentary rock weathers and erodes.
C
Sediments compact and cement together.
D
Sedimentary rock experiences cooling and melting.
12

This is Mohs hardness scale.

Question illustration
A
apatite, quartz, fluorite, talc
B
diamond, talc, fluorite, topaz
C
talc, calcite, orthoclase, diamond
D
corundum, quartz, calcite, gypsum
14

Which two processes are destructive forces that occur during sedimentary rock formation?

A
cementation and compaction
B
compaction and deposition
C
deposition and weathering
D
weathering and erosion

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