Igneous Rocks

Question 1

From Latin word “________” meaning fire

Answer 1

Ignis

Question 2

It is based on size, shape, arrangement and degree of crystallinity.

Answer 2

Texture

Question 3

The minerals present in this rock type are Pyroxene, amphibole ± olivine, and biotite.

Answer 3

Gabbro / Basalt

Question 4

Give one example of intrusive rocks.

Answer 4

Granite or Diorite or Gabbro or Peridotite

Question 5

Large igneous bodies deep beneath the Earth.

Answer 5

Pluton

Question 6

Nearly vertical structure that cuts across pre-existing layering.

Answer 6

Dike

Question 7

Nearly horizontal structure injected between pre-existing layering.

Answer 7

Sill

Question 8

Dome-shaped intrusion

Answer 8

Laccolith

Question 9

Lenticular intrusion with a depressed central region.

Answer 9

Lopolith

Question 10

Angular clast (greater than 64 mm)

Answer 10

Blocks

Question 11

Rounded clast (greater than 64 mm)

Answer 11

Bombs

Question 12

Igneous rocks that are 2-64mm in diameter

Answer 12

Lapilli

Question 13

Igneous rocks that are 2 mm lo diameter

Answer 13

Ash

Question 14

Fragments of rocks.

Answer 14

Lithic

Question 15

Glassy fragments.

Answer 15

Vitric

Question 16

Measurements of the fragments of rocks erupted by a volcano.

Answer 16

Pyroclastic Size

Question 17

The magma type Andesitic ranges from ______ to ________ temperature.

Answer 17

900-1000 °C

Question 18

The viscosity of an ultrabasic magma is called _______

Answer 18

Low to Very Low

Question 19

Ultramafic, mafic and felsic are ________ terms

Answer 19

Color

Question 20

This is formed when there is decrease in pressure, addition of Volatiles or heat
transfer from rising magma.

Answer 20

Magma

Question 21

Determines the percentage of dark-colored and light-colored minerals.

Answer 21

Composition

Question 22

Based on completeness of crystal form and size.

Answer 22

Crystal Form

Question 23

The depth of this structure is greater than 100km².

Answer 23

Batholith

Question 24

What do you call a crystal form that has complete crystal faces.

Answer 24

Euhedral

Question 25

It has no observable crystal faces.

Answer 25

Anhedral