Igneous Rock

Question 1

Light colored rock that is high in silica

Answer 1

Felcic

Question 2

Acidic rock

Answer 2

Felsic rock

Question 3

Gray colored
Ex: andesite and diorite

Answer 3

Intermediate

Question 4

Dark colored
Silica and alkalis is less

Answer 4

Mafic

Question 5

Basic rock

Answer 5

Mafic rock

Question 6

Very dark colored
Highest density
Quartz is absent

Answer 6

Ultramafic

Question 7

Fine grain
Fast cooling at the surface

Answer 7

Aphanitic

Question 8

Course grain
Slow cooling

Answer 8

Phanitic

Question 9

Large crystal embedded on the small mineral

Answer 9

Porphyritic

Question 10

Wholly glassy texture

Answer 10

Holohyaline

Question 11

Partially crystalline and glassy

Answer 11

Merocrystalline

Question 12

Wholly crystalline

Answer 12

Holocrystalline

Question 13

Minerals are completely bounded by crystal faces

Answer 13

Eurheral

Question 14

Idiomorphic

Answer 14

Eutheral

Question 15

Xenomorphic

Answer 15

Anhedral

Question 16

Crystal faces are absenr

Answer 16

Anhedral

Question 17

Partly bounded by crystal faces

Answer 17

Subhedral

Question 18

Plutonic rock

Answer 18

Intrusive

Question 19

-Formed under great pressure at high temperature
-There is presence of volatile

Answer 19

Plutonic

Question 20

Extrusive rock

Answer 20

Volcanic

Question 21

Solidifies under low pressure and in absence of volatiles

Answer 21

Volcanic / extrusive

Question 22

-spongey
- develop due to the exsolution and entrapment of gas bubbles

Answer 22

Vesicular structure

Question 23

Deposits of surface water subsequently fills up vesicles

Answer 23

Amygdaloidal

Question 24

Numerous parallel polygonal prismatic columns bundheld together

Answer 24

Columnar structure

Question 25

Made up of numerous number of sheets because of the development of nearly horizontal cracks

Answer 25

Sheet structure

Question 26

Appears as a pile of numerous overlapping pillows or cracks

Answer 26

Pillow structure

Question 27

Small discordant pluton

Answer 27

Stock

Question 28

The discordant is more than 100sq km

Answer 28

Batholith

Question 29

Tabular body cutting across bedding

Answer 29

Dikes

Question 30

Concordant tabular body

Answer 30

Sills

Question 31

Blister shaped sill

Answer 31

Laccolith

Question 32

-cylindrical shaped body
-magma is highly viscous

Answer 32

Bysmalith

Question 33

Saucer shaped concordant body
Flat top and convex bottom

Answer 33

Lopolith

Question 34

Thick sedimentary are folded then the empty spaces are occupied by magma

Answer 34

Phacolith

Question 35

A rock formed out of volcanic dust

Answer 35

Tufg

Question 36

Rock fragments that are thrown out during the eruption

Answer 36

Pyroclasts

Question 37

Smaller framents of pyroclast

Answer 37

Lapilli