Igneous

Question 1

Equigranular texure

Answer 1

Where the crystals are same sized

Question 2

Vesicular texture

Answer 2

Where gas bubbles have cooled leaving holes

Question 3

Porphyritic texure

Answer 3

Phenocrysts - Larger crystals - Formed first slowly
Finer grained groundmass formed around afterwards

Question 4

Glassy

Answer 4

Magma erupted onto land formed quickly, leaving no time for crystals to form

Question 5

Fragmental (tuff)

Answer 5

Ash (Less than 2mm), Lapilli (Between 2mm and 64mm), Bombs and blocks (Over 64mm)

Question 6

Structures

Answer 6

Pillow lava, Aa/Pahoehoe, Columnar jointing

Question 7

Dykes

Answer 7

sheet like intrusions which are discordant

Question 8

Sills

Answer 8

sheet like intrusions that are concordant and parallel to the beds

Question 9

Some sills occasionally cut across the beds

Answer 9

Transgressive sills

Question 10

Batholiths

Answer 10

Largest intrusions usually discordant

Question 11

Lahars

Answer 11

Volcanic ash mixes with water to form a dense slurry similar to freshly mixed concrete