Deck 24: Introducing Rocks

Question 1

Igneous rocks form from ________.

A)heat and pressure applied to a rock
B)precipitation of minerals out of a solution
C)sediments cemented together
D)molten rock cooling and forming crystals

Answer 1

D

Question 2

What do geologists call the layering seen in this picture?

A)tilted bedding
B)metamorphic foliation
C)sedimentary layers
D)cleavage planes

Answer 2

B

Question 3

How does a metamorphic rock form?

A)Melt a rock to form molten material.
B)Subject a rock to high heat and pressure.
C)Break down a rock and then cement the pieces.
D)Cool a melted rock so quickly that no crystals form.

Answer 3

B

Question 4

What type of rock is formed during a volcanic eruption?

A)sedimentary
B)equant
C)metamorphic
D)igneous

Question 5

How would you tell if a rock is crystalline?

A)It contains crystals that have been cemented together.
B)It does not contain crystals at all.
C)It contains interlocking crystals.
D)It contains all one type of crystal.

Question 6

Granite is a type of rock that forms deep underground from magma that cools very slowly.What type of rock is granite?

A)clastic
B)igneous
C)sedimentary
D)metamorphic

Question 7

Which of the following would NOT be considered a rock?

A)a natural material composed of interlocking crystals
B)a natural pile of unconsolidated sand
C)a natural material made of frothy glass
D)a natural material made of shells cemented together

Question 8

Which one of the pictures does NOT show (a)rock(s)?

A)Figure A
B)Figure B
C)Figure C
D)Figure D

Question 9

Imagine you are holding a rock composed of small sand grains cemented together.What subclassification of sedimentary rock is this?

A)clastic
B)chemical
C)igneous
D)crystalline

Question 10

What type of rock is shown in the picture?

A)clastic
B)sedimentary
C)igneous
D)metamorphic

Question 11

If a rock is subjected to high heat and pressure,a(n)________ rock will form.

A)igneous
B)molten
C)metamorphic
D)sedimentary

Question 12

What is the purpose of the cement surrounding the grains in the photo?

A)It creates a coherent,intact rock.
B)It allows water to move through the rock.
C)It holds the grains together during deposition.
D)It provides a way to transfer chemicals between minerals.

Question 13

Composition describes the ________.

A)degree of compaction and cementation in a rock
B)arrangement of minerals in a rock
C)presence of layers of minerals in a rock
D)chemical makeup of a rock

Question 14

What type of rock is shown in the picture?

A)sedimentary
B)igneous
C)metamorphic
D)crystalline

Question 15

Where would you expect to find metamorphic rocks forming?

A)deep inside a mountain range
B)inside a lava flow on Hawaii
C)under the water at the mid-ocean ridge
D)at the bottom of the Mediterranean Sea

Question 16

Which is a characteristic used to classify a rock?

A)mineral stability
B)rock texture
C)water content
D)degree of weathering

Question 17

Which type of rock is formed by precipitation of minerals from a solution?

A)metamorphic
B)glassy
C)sedimentary
D)igneous

Question 18

What type of rock would you expect to form from the material found along a beach?

A)crystalline
B)sedimentary
C)metamorphic
D)igneous

Question 19

What is the term used for the arrangement of the minerals in the picture?

A)equant
B)porous
C)crystalline
D)cemented

Question 20

What type of rock is being formed in the picture?

A)igneous
B)sedimentary
C)metamorphic
D)inequant

Question 21

Geologists sometimes use analytical equipment to help identify rocks.One commonly used machine is the electron microprobe,which focuses a beam of electrons on a sample to determine ________.

A)the amount of radioactive minerals
B)how atoms are arranged
C)the atomic weight
D)the chemical composition

Question 22

Why do geologists classify rocks?

A)to determine the chemical makeup of the Earth
B)because rocks are the key to determining how the Earth formed
C)because it makes it easier to tell them apart
D)so that they can tell how old the rock is

Question 23

The picture below shows a(n)________ of rock that geologists use to determine the minerals in the rock.

A)hand sample
B)thin section
C)outcrop
D)X-ray

Question 24

What type of texture is shown in the photomicrograph?

A)foliation
B)crystalline
C)sedimentary
D)clastic

Question 25

Why do geologists use thin sections of rocks?

A)to determine if the rock is molten
B)to identify foreign substances
C)to identify the minerals
D)to determine the arrangement of atoms