19. Descending limbs of convection cells may be present beneath: a. mid-oceanic

Question

19. Descending limbs of convection cells may be present beneath: a. mid-oceanic ridges b. continental mountain ranges c. shields d. oceanic trenches 20. Assume spent Uranium with a density of 19000 kg/m2 is buried in soil with a density of 1500 a. b. c. d. kg/mwithin large metal containers 200 ft beneath the surface in Texas. What would you expect from a gravity survey designed to locate the containers? Strong negative gravity anomaly Strong positive gravity anomaly No anomaly because of the low density of Uranium relative to soil Negative anomaly due to the large volume of low density soil 21. What period in earth history did the first land plants appear? a. Precambrian b. Jurassic d. Silurian 22. Which of the following do the minerals quartz and calcite have in common? a. Both have perfect cleavage b. Both are formed from shells and skeletons of sea animals c. Both have a hardness of 3 d. Both have vitreous luster 23. Which of the following statements pertain to the mineral calcite? a. The chemical formula is CaCO b. Calcite is the major mineral constituent of limestone which is crushed to make Portland cement c. Calcite can occur in the same rock with the mineral quartz d. All of the above 24. What is the relationship between cleavage and crystal faces in a mineral? a. Cleavage planes are normal to atomic planes b. Every cleavage plane could be a crystal face c. Cleavage occurs between atomic planes with a strong binding force d. None of the above

Explanation / Answer

19. Descending convection limbs present in: a. Mid Oceanic Ridges.

21. First land plants appeared on: d. SIlurian

22. WHich of the following do minerals quartz and calcite have in common: d. Both have vitreous lustre23. Which of the following statements pertain to mineral calcite: d. All of the above are correct.

24. Relationship between cleavage and crystal faces in a mineral: d. None of the above

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