Geo test 2 electric boogaloo

Granite, an intrusive igneous rock is most similar in mineral composition to which extrusive rock type

• basalt

• andesite

• rhyolite

• gabbro

A volcanic arc results from ___ tectonic movements and is associated with ___

• divergent; mid-ocean ridge

• convergent; subduction zone

• divergent; hot spot

• convergent; mid-ocean ridge

Intrusive rocks that form deep within the earth ___ than intrusive rocks that cool near the surface

• are more felsic

• contain a smaller proportion of volatiles

• cool more slowly

• are less dense

how is magma generated at divergent boundaries

• increase in temperature

• decompression melting

• magmatic underplating

• water under pressure

at what tectonic setting does the mantle melt due to a lower mantle solidus (melting temperature) from the addition of water

• hotspot

• transform boundary

• subduction zone

• spreading center

A majority of melts on earth form through the melting of mantle rock. These newly formed magmas are always ___ in compositon

• granite

• andesite

• basalt

• rhyolite

A basalt can differentiate into a more Si-Rich magma through a process called ___. In this process a solid rock is exposed to heat and the more Si-rich minerals in the rock melt first producing a more felsic melt.

• fractional crystallization

• partial melting

• magma mixing

• crustal assimilation

A mixture of air, hot ash, and pumice lapilli that rushes down the side of a volcano in a scalding avalanche is termed a(n) ___

• lahar

• pyroclastic flow

• convective plume

• ash fall

if a body of magma becomes more felsic it's viscocity will ___

• have no correlation to it's chemical composition

• stay the same

• increase

• decrease

Bombs, ash, and cinders are all examples of ___

• intrusive igneous rocks

• lava flows

• volatiles

• pyroclastic debris