(31) As the magmas of the Early Earth cooled they began to form homogeneous, nat
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Question
(31) As the magmas of the Early Earth cooled they began to form homogeneous, naturally-occurring, solid inorganic substances with definable chemical composition and an orderly arrangement of atoms, ions, or molecules called
(a) rocks
(b) minerals
(c) lattices
(d) ores
(32) In the fundamental structural unit of silicate minerals, the silicon ion is surrounded by how many oxygens to form what shape?
(a) 4, tetrahedron
(b) 5, pentahedron
(c) 6, octahedron
(d) none of these
(33) Mixtures of minerals will melt at _____________________ than the melting temperatures of the individual minerals.
(a) a higher temperature
(b) at the same temperature
(c) at a lower temperature
(d) none of the above
(34) Fumeroles produce minerals that form by
(a) crystallization in a lava
(b) sublimation from gases
(c) weathering of rocks
(d) evaporation of lakes
(35) Which of the following cooled most slowly
a) pahoehoe
b) aa
c) intrusive igneous rocks
d) extrusive igneous rocks
(36) Minerals that form at highest temperature in Bowen
Explanation / Answer
(a) rocks (b) 5, pentahedron (c) at a lower temperature (b)sublimation from gases d)extrusive igneous rocks (a) are least resistant to chemical weathering (b) (d) formed only during cooling of the early molten Earth. (d) Al2O3 (d) none of the above (d) an arrangement of atoms in a mineral (b)the hot rock loses volatiles as it rises (d) all of the above (b) the greater the likelihood that it will form meanders (a) shows graded bedding (c) is a framework silicate (c) is caused by the solar wind (d) 23.3% (c) they will always get some melting , that is how freezing point depression works (c) all of the water will turn into ice and crystals of salt
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