Exam 2

Question 0

Melting in the crust creates

Answer 0

Felsic magma

Question 1

Melting in the mantle creates

Answer 1

Mafic magma

Question 2

Intermediate magmas

Answer 2

Mafic and felsic magmas mixed together

Question 3

Felsic magma results in what kind of explosions

Answer 3

Explosive, violent

Question 4

Mafic magma generates what kind of explosions

Answer 4

Calm, less explosive

Question 5

Caldera

Answer 5

Large volcanic depression created by violent eruption

Question 6

Magma chamber

Answer 6

Underground body of molten rock

Question 7

Magma chamber in oceanic lithosphere

Answer 7

Form over hotspots in mid ocean ridges

Mafic magma

Question 8

Pluton

Answer 8

Solidified magma chamber

Question 9

Stock

Answer 9

Pluton with exposed area of less than 100 square km

Question 10

Batholith

Answer 10

One or more contiguous plutons that cover more than 100 square km

Question 11

Dike

Answer 11

Sheet like intrusion that cuts across any layers present in the host rocks

Question 12

Sill

Answer 12

Intrusion that is parallel to layers in host rock

Question 13

Laccolith

Answer 13

Bulge shaped magma body

Question 14

How do volcanic necks form

Answer 14

Erosion wears down a volcano, exposing the harder rocks inside the magmatic conduit

Question 15

Columnar joints

Answer 15

Cooling fractures

Question 16

How do columnar joints form

Answer 16

Hot but solid igneous rock contracts as it cools and the fractures carve out columns