A naturally occurring concentration of one or more metallic minerals that can be extracted economically is a(n) ________
A) ore B) reserve C) resource D) tailing
A
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Why is the texture of the igneous rock obsidian glassy?
A) Obsidian commonly forms at the surface of lava flows. B) Obsidian always forms beneath the earth's surface. C) Obsidian is aphanitic. D) Obsidian is phaneric.
________ is the volume of voids or open space in a rock or unconsolidated material
A) Porosity B) Saturation index C) Permeability D) Space yield
Convergent plate boundaries are characterized by formation of new oceanic crust
a. True b. False
For most environmental issues, the solutions are
A) certain, and the science is certain. B) complex, but the science is certain. C) complex, and the science is insightful but tentative and evolving. D) clear and certain, and the science is insightful but tentative.