Chapter 4

Question 1

Magma

Answer 1

molten rock below earths surface

Question 2

2 most abundant gases in magma

Answer 2

h20 c02

Question 3

lava

Answer 3

molten rock above earths surface

Question 4

geothermal gradient

Answer 4

Geothermal gradient is the rate of increasing temperature with respect to increasing depth in the Earth’s interior.

Question 5

why does magma move upward

Answer 5

The centre of the earth is hottest, so magma near the core gets hotter and therefore moves upwards towards the crust. It then cools because it is further from the core and falls back down, creating a contstant current of moving magma.

Question 6

Plutons

Answer 6

a body of an intrusive rock

Question 7

dikes

Answer 7

a sheet of rocks that formed in a fracture

Question 8

sills

Answer 8

a tabular sheet intrusion that has formed between older layers

Question 9

laccoliths

Answer 9

injected between two sedimentary rocks

Question 10

stocks

Answer 10

smaller batholiths

Question 11

batholiths

Answer 11

LARGEST IGNEOUS ROCK over 100 square kilometers

Question 12

what is tuff formed from

Answer 12

debris ejected from a volcanic explosion

Question 13

glassy igneous rocks

Answer 13

obsidian