Igneous Rock Characteristics and Identification

The video tutorial covers the identification of igneous rocks, focusing on their color, grain size, and texture. It explains how to use an identification sheet and tools like a hand lens to classify rocks based on these characteristics. The tutorial also discusses the cooling rates of rocks and provides a practical example of identifying a granite rock.

What is the primary characteristic used to identify igneous rocks?

• Their age

• Their color and grain size

• Their location of origin

• Their magnetic properties

Which color category of igneous rocks is characterized by a pinkish, light color?

• Ultramafic

• Mafic

• Felsic

• Intermediate

What is the main color characteristic of mafic igneous rocks?

• Light

• Dark

• Pink

• Green

Which grain size classification is characterized by very large crystals?

• Pegmatic

• Porphyritic

• Phaneritic

• Aphanitic

What texture is associated with igneous rocks that have vesicles or small bubbles?

• Porphyritic

• Glassy

• Vesicular

• Phaneritic

How do intrusive igneous rocks differ from extrusive ones?

• They cool slowly and have large crystals

• They cool quickly and have small crystals

• They are formed from lava

• They are always dark in color

What is the cooling process of extrusive igneous rocks?

• They cool quickly inside the Earth

• They cool slowly outside the Earth

• They cool quickly outside the Earth

• They cool slowly inside the Earth

In the example given, what color was predominantly observed in the igneous rock?

• Blue

• Green

• Dark

• Pink

What mineral is associated with the pink color in the example rock?

• Biotite

• K Feldspar

• Olivine

• Quartz

What type of igneous rock was identified in the example?

• Peridotite

• Granite

• Basalt

• Gabbro