GG 101 Exam 1 Questions and
Answers.
Igneous rocks and metamorphic rocks derived from igneous "parents" make up what
percentage of the Earth's crust? - Answer 95%
What three components make up most magmas? - Answer Liquid Portion, Solid Portion,
Gaseous Portion
What is a volatile? - Answer Gases dissolved in a magma
Select the choice below that best describes the role of volatiles in an ascending magma. -
Answer Volatiles will expand with decreasing pressure, carrying the melt upward
What was the rate of cooling and the environment of formation for an extrusive igneous rock? -
Answer Fast because it was erupted from a volcano
Which mineral class makes up most igneous rocks? - Answer Potassium Feldspar
Which of the following minerals is not a ferromagnesian mineral? - Answer Potassium
Feldspar
Peridotite is the main constituent of which part of the Earth? - Answer Upper mantle
Which two minerals define a felsic composition? - Answer Quartz and Potassium Feldspar
Answers.
Igneous rocks and metamorphic rocks derived from igneous "parents" make up what
percentage of the Earth's crust? - Answer 95%
What three components make up most magmas? - Answer Liquid Portion, Solid Portion,
Gaseous Portion
What is a volatile? - Answer Gases dissolved in a magma
Select the choice below that best describes the role of volatiles in an ascending magma. -
Answer Volatiles will expand with decreasing pressure, carrying the melt upward
What was the rate of cooling and the environment of formation for an extrusive igneous rock? -
Answer Fast because it was erupted from a volcano
Which mineral class makes up most igneous rocks? - Answer Potassium Feldspar
Which of the following minerals is not a ferromagnesian mineral? - Answer Potassium
Feldspar
Peridotite is the main constituent of which part of the Earth? - Answer Upper mantle
Which two minerals define a felsic composition? - Answer Quartz and Potassium Feldspar
