Igneous Rocks Review for Mod 2

Igneous rocks that are formed inside the earth's crust are known as which of the following?

• Mafic

• Intrusive

• Extrusive

• Felsic

Igneous rocks that are formed at the earth’s surface are known as which of the following?

• Mafic

• Intrusive

• Extrusive

• Felsic

Igneous rocks are classified using which of the following?

• Texture and composition

• Environment and metal content

• Composition of and metal content

• Texture and metal content

The appearance of an igneous rock, based on the size, shape and arrangement of interlocking crystals is known as what?

• Composition

• Aphanism

• Texture

• Metal content

The mineral makeup of an igneous rock based on the chemical composition of magma is known as which of the following?

• Composition

• Aphanism

• Texture

Which of the following are the main factors affecting the texture of igneous rocks?

• Cooling rate and Dissolved gases

• Dissolved gases and Magma content

• Cooling rate and Magma content

• Magma content and Lava content

A slow cooling process within the earth’s crust results in which of the following?

• Aphanitic texture

• Phaneritic texture

• Frothy texture

• Glassy texture

A quick cooling process on or near the earth's surface, results in which of the following?

• Phaneritic

• Aphanitic

• Porphyritic

• Coarse grained

The resulting texture when a lava flow is nearly instantaneously solidified without any time for crystals to form is called?

• Aphanitic texture

• Phaneritic texture

• Frothy texture

• Glassy texture

What texture is formed when a magma body crystallizes slowly then the remaining magma is ejected in a lava flow, resulting in large crystals in a fine grained matrix?

• Phaneritic

• Aphanitic

• Porphyritic

• Coarse grained