igneous rock powerpoint

for the exam good luck farts :)

what da freak a igneous rock

born of fire (badass), form when molten minerals (magma) solidify

where does the creation of magma happen

50-250 km

what is decompression melting??

the upward movement of Earth's mostly solid mantle; hot material rises to an area of lower pressure

what are the 3 ways heat can be caused??

radioactivity, friction, and residual heat

what is radioactivity heat?

he heat released as a result of radioactive decay ex. sun

what is friction heat?

when two plates are rubbing together

what is residual heat?

heat that is left over

what does it mean for a rock to mafic?

less silica, high temperatures, usually dark in color, oceanic continental boundary ex. basalt

what does it mean for a rock to be felsic?

more silica, low temperatures, usually light in color, continental oceanic boundary ex. granite

what does mafic lava look like?

thick, dome-like, blob

what does felsic lava look like?

runny and thin

what is assimilation?

when lava sits in a lava chamber and nearby wall rock falls into the lava chamber and dissolves into the mixture.

what does assimiliation produce?

xenoliths

what is magma mixing?

when felsic and mafic magma mix

what does assimilation and magma mixing do?

changes the composition of the magma

what are the 3 ways magma rises?

1. density
2. gas exspansion
3. pressure

what determines crystal size??

cooling time

the larger the crystal…

the slower it took to cool

the smaller the crystal…

the quicker it took to cool

how hot does it have to be for igneous rocks to form?

800 degrees C and higher

what is an intrusive igneous rock?

rock formed by the freezing of magma underground

what are the characteristics of intrusive igneous rocks?

larger crystals, phanerectic

what is an extrusive igneous rock?

Rock that forms by the freezing of lava above ground after coming in contact to the Earth’s atmosphere or ocean/water

what are the characteristics of extrusive rocks?

small crystals, aphanetic

What is an intermediate igneous rock?

a mix of both felsic and mafic

what are the characteristics of an intermediate igneous rock?

porphyritic, a mixture of large and small crystals

what are some major types of igneous rocks?

glassy, vesicular, pyroclastic

what are some igneous structures?

sill, dike and neck, batholith, pillowbasalts