Igneous Rock and Magma Concepts

The video tutorial explains the formation and movement of igneous rocks, focusing on magma movement, intrusions, and the resulting geological formations. It covers magma diapirs, interactions with country rock, and the formation of dikes, sills, and xenoliths. Various types of igneous intrusions, such as batholiths and laccoliths, are discussed, along with volcanic necks and erosion processes. The tutorial provides examples of geological formations, including the Sierra Nevadas and Yosemite National Park.

What is the term for igneous rock that cools deep underground?

• Laccolith

• Volcano

• Pluton

• Dike

Why does magma rise through the Earth's crust?

• It is pulled by gravity

• It is pushed by tectonic plates

• It is less dense than surrounding rock

• It is more dense than surrounding rock

What is a magma diapir?

• A cooled pluton

• A type of volcano

• A blob of magma

• A type of sedimentary rock

What is a xenolith?

• A type of metamorphic rock

• A sedimentary layer

• A foreign rock within an igneous intrusion

• A type of igneous rock

What happens when magma heats the surrounding rock?

• It forms a sill

• It becomes a dike

• It turns into a metamorphic rock

• It forms a new volcano

What is a batholith?

• A sedimentary rock formation

• A type of dike

• A large intrusion of magma

• A small volcanic neck

How can you identify a composite volcano?

• By its flat shape

• By its ash layers and cone shape

• By its underground formation

• By its sedimentary layers

What is Ship Rock an example of?

• A batholith

• A laccolith

• A volcanic neck

• A sill

What type of rock is El Capitan primarily composed of?

• Andesite

• Rhyolite

• Granite

• Basalt

What geological feature is the Sierra Nevada batholith?

• A metamorphic zone

• A sedimentary basin

• A large granite intrusion

• A volcanic neck