The Rock Cycle & Igneous Rocks

According to Bowen's reaction series, as a magma cools what would be the correct sequence of mineral crystallization from first (highest temperature) to last (lowest temperature):

• olivine, amphibole, quartz

• quartz, biotite, pyroxene

• potassium feldspar, quartz, olivine

• pyroxene, quartz, amphibole

Which igneous rock composition contains the least silica?

• Felsic

• Intermediate

• Mafic

• Ultramafic

Felsic igneous rock will typically contain sodium-rich plagioclase, biotite, potassium feldspar, muscovite and quartz.

• True

• False

Tags

NGSS.MS-PS1-1

Which one of these volcanic rock samples is intermediate in composition?

• C

• B

• A

Tags

NGSS.MS-ESS2-1

Which of the volcanic rock samples above has the highest amount of the elements iron (Fe) and magnesium (Mg)?

• A

• B

• C

Name this igneous texture.

• aphanitic

• phanaritic

• glassy

• vesicular

Which two statements are true of Igneous rocks?

• volcanic = plutonic

• intrusive = plutonic

• intrusive = volcanic

• extrusive = volcanic

Igneous rocks are classified based on?

• composition & texture

• color & cementation

• foliation & hardness

• origin and grain size

Felsic igneous rocks contain mostly which minerals?

• 
  K-Feldspar, Na-rich Feldspar & Quartz

• 
  Olivine, Pyroxene & Ca-rich Feldspar

• 
  Mostly Olivine

• 
  Both dark & light minerals in roughly equal proportions

Tags

NGSS.MS-PS1-1

Mafic igneous rocks contain mostly which minerals?

• 
  K-Feldspar, Na-rich Feldspar & Quartz

• 
  Olivine, Pyroxene & Ca-rich Feldspar

• 
  Mostly Olivine

• 
  Both dark & light minerals in roughly equal proportions

Tags

NGSS.MS-PS1-1