Igneous Rock Identification - Viewing samples

Front

Where is lava located?

Back

Above ground.

Front

What type of rock is Gabbro?

Back

Gabbro is an intrusive igneous rock.

Front

What does the presence of granite in Yosemite National Park indicate about its formation?

Back

It indicates that the rocks are intrusive.

Front

Which texture type of igneous rock takes the longest to cool?

Back

Coarse-grained.

Front

What is the environment of formation for extrusive igneous rocks?

Back

Extrusive igneous rocks form from lava that cools quickly at the surface.

Front

Define intrusive igneous rock.

Back

Intrusive igneous rocks are formed from magma that cools slowly beneath the Earth's surface.

Front

Define extrusive igneous rock.

Back

Extrusive igneous rocks are formed from lava that cools quickly at the Earth's surface.

Front

What is the difference between mafic and felsic rocks?

Back

Mafic rocks are rich in magnesium and iron, while felsic rocks are rich in silica and aluminum.

Front

What is the significance of texture in igneous rocks?

Back

Texture indicates the cooling history and environment of formation of the rock.

Front

What is a porphyritic texture?

Back

A porphyritic texture is characterized by large crystals embedded in a finer-grained matrix.