Igneous Rock Mastery Quiz

Which of the following best describes igneous rocks?

• Rocks formed through the cooling and solidification of magma or lava

• Rocks that have been transformed by heat and pressure

• Rocks formed by the accumulation and cementation of mineral grains

• Rocks that contain fossils

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

• The mineral composition

• The size of the crystals

• The color of the rocks

• The location where they are found

Which mineral is most commonly found in igneous rocks?

• Calcite

• Quartz

• Gypsum

• Halite

What does the term "mafic" refer to in igneous rocks?

• High silica content

• High magnesium and iron content

• Presence of quartz

• Light color

Which of the following is a characteristic of felsic igneous rocks?

• Dark color and high density

• High silica content

• Predominantly made of olivine

• Low silica content

Basalt is an example of what type of igneous rock?

• Intrusive

• Extrusive

• Metamorphic

• Sedimentary

Granite is an example of what type of igneous rock?

• Intrusive

• Extrusive

• Metamorphic

• Sedimentary

What role does the cooling rate of magma or lava play in the texture of igneous rocks?

• Faster cooling rates produce larger crystals

• Slower cooling rates result in a glassy texture

• Faster cooling rates result in smaller crystals

• Cooling rate has no effect on texture

Which type of silicate structure is represented by individual tetrahedrons not linked to each other?

• Framework silicates

• Sheet silicates

• Isolated tetrahedra

• Double chain silicates

What is the significance of Bowen's Reaction Series in the study of igneous rocks?

• It predicts the color of igneous rocks

• It describes the sequence of mineral crystallization from magma

• It determines the exact location where igneous rocks will form

• It measures the hardness of igneous rocks