Igneous Rock Quiz

Which factor primarily determines the type of igneous rock that forms from magma?

• Cooling rate

• Composition of the magma

• Location of formation

• Pressure applied

What is the process called when some minerals melt at lower temperatures while others remain solid?

• Fractional crystallization

• Partial melting

• Bowen’s reaction series

• Magma differentiation

In Bowen’s reaction series, which minerals are represented on the left branch?

• Quartz and feldspar

• Iron-rich minerals

• Plagioclase feldspars

• Olivine and pyroxene

How does water content affect the melting point of rocks?

• It has no effect

• It increases the melting point

• It decreases the melting point

• It only affects igneous rocks

Tags

NGSS.HS-ESS2-5

Which type of igneous rock forms when magma cools and crystallizes below the Earth's surface?

• Extrusive rock

• Intrusive rock

• Basaltic rock

• Granitic rock

What is the main difference between intrusive and extrusive igneous rocks?

• Their color

• Their mineral composition

• Their cooling location

• Their crystal size

Which type of rock is characterized by a spongy appearance due to trapped gas bubbles?

• Granitic rock

• Vesicular rock

• Pegmatite

• Kimberlite

How does the cooling rate of lava affect the size of crystals in igneous rocks?

• Faster cooling leads to larger crystals

• Slower cooling leads to smaller crystals

• Faster cooling leads to smaller crystals

• Cooling rate has no effect on crystal size

What process occurs when the first minerals to crystallize in cooling magma are removed, affecting the remaining magma's composition?

• Partial melting

• Fractional crystallization

• Bowen’s reaction series

• Magma differentiation

What is the role of temperature in the formation of magma?

• It has no significant role

• It decreases the melting point of rocks

• It generally increases with depth in the Earth’s crust

• It only affects the cooling of magma

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4