Igneous Rocks Tutorial Quiz

What is the primary focus of the tutorial on page six of the reference table?

• Analyzing metamorphic rocks

• Explaining igneous rocks using hand samples

• Studying mineral properties

• Discussing sedimentary rocks

Which characteristic is NOT associated with pegmatite?

• Intrusive nature

• Light-colored

• Very coarse texture

• Formed quickly at the surface

What distinguishes granite from pegmatite?

• Granite forms at the surface

• Granite has larger crystals

• Granite is darker in color

• Granite has a coarse texture

Which rock is a dark-colored intrusive igneous rock?

• Basalt

• Gabbro

• Pumice

• Rhyolite

What is the texture of rhyolite?

• Glassy

• Coarse

• Very coarse

• Fine

Which rock is known for having gas pockets and is mafic in nature?

• Granite

• Obsidian

• Pegmatite

• Scoria

What unique property does pumice have due to its vesicular texture?

• It is magnetic

• It floats on water

• It is heavier than water

• It is transparent

Which rock has a glassy texture and is felsic?

• Gabbro

• Scoria

• Basalt

• Obsidian

What is a key characteristic of a glassy texture in rocks?

• No crystals at all

• Large visible crystals

• Gas pockets

• Coarse grains

Which of the following rocks is NOT extrusive?

• Rhyolite

• Basalt

• Granite

• Obsidian