Flashcards in Melting of Rocks and Plutons Deck (20)
In order for a volcanic eruption to occur you have to have some sort of ______ rocks
rocks generally melt between ____ and ____ degrees celsius
to under stand volcanism and volcanic eruption, you must understand...
how rock melts
crustal temperature increases with...
Lower pressure promotes ______
what does lower pressure cause?
a lower melting point in rocks
Rocks melt at lower temperatures if the pressure is ______
If the pressure increases you need to reach _____ temperatures in order for the rock to melt
Any presence of ______ in a rock lowers melting point
what does the presence of moisture do to a rock?
lowers its melting point
rocks melt when...
- temperature increases
- pressure decreases
- water is added to the rock
what are plutons?
magma that never reaches the surface
what are five types of plutons?
batholiths, stocks, dikes, sills, and volcanic necks
how can a pluton reach the surface?
after it cools and becomes igneous rock, the layers above may become eroded away, exposing the plutons
which is the largest pluton?
what are dikes and sills?
thin layers of plutons
what is the difference between a dike and a sill?
a dike cuts across existing layers, and a sill squeezes in parallel
what is a volcanic neck?
a volcano that never erupted
is this a dike or sill?