Practice Quiz 1 - Page 1 of 5 40 questions 100 points W...

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February 21, 2006 W Name (printed) _________________________________________ Page 1 of 5 40 questions 100 points GEO 303, Quiz 1 INSTRUCTIONS : (i) On the answer sheet, blacken the “bubbles” indicating your name and UT stu- dent number under “Identification.” (ii) Place a "W" (for white exam) on your answer sheet. (iii) Using a #2 pencil, bubble in the answers to questions. For each question give the best (most inclusively cor- rect) answer. (iv) Turn in this exam copy and your answer sheet together, with your name on both. 1. Which is the best theory to explain the origin of the moon? (A) spun off of the early earth as it ro- tated faster and faster; (B) formed in another part of the solar system, later to be captured into an orbit around the earth; (C) formed from comets that collided and stuck together; (D) formed from debris ejected from a stupendous impact between the early earth and another object the size of Mars. 2. Which statement about a mineral is correct and the reason given is also correct? (A) Diamond is a mineral because it is very hard. (B) Coal is a mineral because it is part of the earth. (C) Glacier ice is a mineral because it occurs naturally, is inorganic, with a definite composition (H 2 O) and crystalline structure. (D) Petroleum is a mineral because a lawyer speaks of “mineral rights” with regard to an oil lease property. 3. Which statement most accurately describes the eruption of basalt in Hawaii? (A) The lava consists of melted basaltic Pacific Ocean floor, which lies beneath Hawaii. (B) As hot but solid mantle rock moves upward beneath Hawaii, it experiences decompression melting. (C) Only under Hawaii is the earth’s mantle hot enough to melt, producing basalt magma. (D) As it comes in contact with hot basaltic magma, ocean water flashes into steam causing catastrophic, explosive eruptions. 4. Columns in the table below show an original mineral, what it transforms into by chemical weather- ing, and a CLASTIC sedimentary rock made by deposition of the weathering product. Which combina- tion of the three columns answers the following questions? (i) What is the most abundant mineral in the earth’s crust? (ii) What is its weathering product? (iii) Therefore, what is the most abundant clastic sedimentary rock? Original mineral Weathering product Clastic sedimentary rock (A) quartz ! (B) feldspar ! (C) feldspar ! (D) quartz ! feldspar ! clay minerals ! Na + in solution ! quartz ! sandstone shale rock salt quartzite 5. Radioactive isotopes useful for dating ancient geologic events: (A) must absorb energy from the en- vironment in order for decay to occur; (B) have extremely short half-lives relative to the age of the earth; (C) increase in abundance as the amount of daughter diminishes in abundance; (D) decay at a fixed, known rate no matter what the local temperature or pressure conditions may be. 6.
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This note was uploaded on 03/19/2008 for the course GEO 303 taught by Professor Leon during the Fall '08 term at University of Texas.

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Practice Quiz 1 - Page 1 of 5 40 questions 100 points W...

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