Home

Chapter 2

Concept #5 Quiz

Concept #5 Quiz
Choose the best possible answer to the following questions about Key Concept 5 "The rock-forming minerals and the composition of the crust."

This activity contains 4 questions.

	Which of the following set of elements account for >98% of the Earth’s crust, in descending order of abundance?   Si, Na, Ca, K, Fe, Al, O, Mg diamond, quartz, calcite, halite O, Si, Fe, Mg, Ca, K, Na, Al O, Si, Al, Fe, Ca, Na, K, Mg

	If there are nearly 4000 minerals identified to date, why is the crust dominated by only a few dozen “common” minerals?   Most of these minerals include the 5 highest percentage elements found in the crust. These minerals include the most abundant elements in the crust. These minerals are "rock-forming" and are found in common rocks. All of these. The first and third answers ONLY.

	Why are silicate minerals the most abundant minerals in the Earth’s crust?   Na and Si are the most abundant elements in the crust. Al and Si are the least abundant elements in the crust. Si and O are the least abundant elements in the crust. Si and O are the most abundant elements in the crust.

	If non-silicate minerals account for only about 8% of the crust, what makes them considered important minerals?   Non-silicate minerals are not considered important at all. Non-silicates are substantially larger in size than silicate minerals. Non-silicate minerals have the same chemical composition, but different atomic structures than those of silicate minerals. Many non-silicates have economic importance due to their occurrence as metallic ores.

Answer choices in this exercise appear in a different order each time the page is loaded.

Copyright © 1995-2008, Pearson Education, Inc., publishing as Pearson Prentice Hall Legal and Privacy Terms