Lesson 4:1 - Igneous Rocks

Which is the first mineral to form in cooling magma?

• quartz

• mica

• potassium feldspart

• olivine

Which process is occurring in the diagram?

• fractional separation

• crystal separation

• fractional crystallization

• partial melting

Which minerals are associated with the right-hand branch of Bowen’s reaction series?

• olivine and proxene

• feldspars

• mica and feldspars

• quartz and biotite

What effect does a fast cooling rate have on grain size in igneous rocks?

• It forms fine-grained crystals.

• It forms large-grained crystals.

• It forms light crystals.

• It forms dark crystals.

Which type of ultrabasic rock sometimes contains diamonds?

• pegmatite

• kimberlite

• granite

• rhyolite

Rock that forms when lava or magma cools and crystallizes

• igneous rock

• lava

• partial melting

• Bowen's reaction series

a model that describes the relationship between cooling magma and mineral formation

• igneous rock

• lava

• partial melting

• Bowen's reaction series

forms when magma cools and crystallizes beneath Earth's surface

• intrusive rock

• extrusive rock

• basaltic rock

• granitic rock

dark-colored rock with low silica content, contains mostly plagioclase and pyroxene

• intrusive rock

• extrusive rock

• basaltic rock

• granitic rock

light-colored rock with high silica content, contains mostly quartz and feldspar

• intrusive rock

• extrusive rock

• basaltic rock

• granitic rock