Geology 001 - Physical Geology » Summer 2021 » Chapter 3 Quiz

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Question #1
Minerals have a crystalline structure. What does this mean?
A.   That the atoms are arranged in random order but definite chemical composition.
B.   That the atoms are arranged in an orderly, repetitive manner.
C.   That the minerals are generally inorganic and not made from life.
D.   That all minerals form beautiful, visible crystals in the right conditions.
E.   That the minerals have a definite chemical composition and are made of the same elements.
Question #2
An ocean rich in calcium and carbon dioxide can produce calcium carbonate (the mineral calcite). This process where minerals crystalize from an ocean water is an example of mineral formation by precipitation.
A.   FALSE
B.   TRUE
Question #3
What elements are in the silica tetrahedra, the basic unit of silicate minerals?
A.   1 oxygen and 1 silicon
B.   1 oxygen and 4 silicons
C.   2 oxygens and 2 silicons
D.   4 oxygens and 4 silicons
E.   4 oxygens and 1 silicon
Question #4
Why are only some minerals found as native minerals? For example, iron and aluminum are almost never found as native elements in nature.
A.   Earth is too cold for native aluminum/iron
B.   Some elements are too reactive
C.   Earth's crust is too acidic for aluminum/iron
D.   They formed at the start of earth and are only found in altered states
E.   Native aluminum/iron only forms in the core.
Question #5
What is the most common crystal habit (geometric shape) of the minerals halite, galena, and pyrite?
A.   Cubic
B.   Fibrous
C.   Rhombic
D.   Dendritic
E.   Prismatic

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