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Flashcards in Melting of Rocks and Plutons Deck (20)
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1

In order for a volcanic eruption to occur you have to have some sort of ______ rocks

melted/molten

2

rocks generally melt between ____ and ____ degrees celsius

800, 1200

3

to under stand volcanism and volcanic eruption, you must understand...

how rock melts

4

crustal temperature increases with...

depth

5

Lower pressure promotes ______

melting

6

what does lower pressure cause?

a lower melting point in rocks

7

Rocks melt at lower temperatures if the pressure is ______

lower

8

If the pressure increases you need to reach _____ temperatures in order for the rock to melt

higher

9

Any presence of ______ in a rock lowers melting point

moisture

10

what does the presence of moisture do to a rock?

lowers its melting point

11

rocks melt when...

- temperature increases
- pressure decreases
- water is added to the rock

12

what are plutons?

magma that never reaches the surface

13

what are five types of plutons?

batholiths, stocks, dikes, sills, and volcanic necks

14

how can a pluton reach the surface?

after it cools and becomes igneous rock, the layers above may become eroded away, exposing the plutons

15

which is the largest pluton?

a batholith

16

what are dikes and sills?

thin layers of plutons

17

what is the difference between a dike and a sill?

a dike cuts across existing layers, and a sill squeezes in parallel

18

what is a volcanic neck?

a volcano that never erupted

19

is this a dike or sill?

dike

20

Is this a dike or sill?

sill