2 Igneous Rocks, Processes, BRS

The process by which igneous rocks are formed...

• heat and pressure deep underneath earth's surface
• melting and cooling of magma
• compaction and cementation of sediments
• recrystallization of minerals within water

Tags

NGSS.MS-ESS2-1

NGSS.MS-ESS2-2

What is the most common Extrusive igneous rock?

• Granite
• Basalt
• Pumice
• Rhyolite

If an Igneous rock is dark-colored, which of the following is TRUE?

• high silica content and felsic

• low silica content and mafic (iron and/or magnesium)

• it must be intrusive and fine grained

• it must be extrusive and coarse grained

Describe this rock

• Intrusive , High Silica, Vesicular
• Intrusive , Low Silica, Porphyritic 
• Extrusive , High Silica, Vesicular
• Intrusive, Low Silica, Glassy

Which igneous rock is an extrusive rock?

• porphyry
• rhyolite
• pegmatite
• granite

_____ is an igneous rock made up of the minerals quartz, mica, feldspar, and hornblende.

• granite
• basalt
• pumice
• gneiss

What statement is true about the sample of diorite shown?

• Diorite is an extrusive igneous rock.
• Diorite is coarse-grained because its crystals are large and easy to see.
• Diorite is fine-grained because its crystals are small and hard to see.
• Diorite is a mineral because of its crystal structure.

What do pumice, basalt, and obsidian have in common?

• They form on Earth's surface from the quick cooling of lava.

• They are extrusive and aphanitic.

• They all have a fine grained texture.

• They have all of these things in common.

According to Bowen's Reaction Series, what mineral assemblage describes a mafic, igneous rock? 

• Quartz, K-spar, biotite, muscovite, some amphibole
• Quartz, some k-spar, so Na-rich plagioclase, some pyroxene, some amphibole
• Ca-rich plagioclase, some olivine, pyroxene, amphibole
• Mostly olivine, some pyroxene and amphibole, Ca-rich plagioclase

According to BRS, the temperature range that one would most likely find a rock that contains olivine and a little bit of biotite, and no quartz would be:

• 750-900 degrees
• 900-1000 degrees
• 1000-1100 degrees
• 1100-1200 degrees