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20 True/False questions

  1. What is the main difference between a conglomerate and a sedimentary breccia?limestones


  2. Which of the following sedimentary rocks would you expect to have originally been deposited by fast-moving streams?evaporates; chemical, sedimentary rocks


  3. Nonclastic textures are common in which of the following sedimentary rocks?limestones


  4. Sedimentary rocks account for about what percentage of the Earth's outermost 10 kilometers of rock (first percentage). Also, what percentage of the Earth's continental area is covered by sedimentary rocks (second percentage)?5%; 75%


  5. Which characteristic is absolutely necessary for a sedimentary rock to have potential as a possible reservoir rock for oil or gas?high porosity


  6. ________, a common mineral found in igneous rocks, is the most abundant mineral in detrital sedimentary rocks.Quartz


  7. Detrital sedimentary rocks are classified (named) based on the ________.grain sizes of the detrital particles


  8. Which type of limestone consists mainly of tiny, marine fossils composed of calcite?chalk


  9. A cherty limestone would contain which major constituents?silica; calcite


  10. ________ is a form of calcium carbonate.freshwater coastal swamps and bogs


  11. Compaction is a very important part of the lithification process for which of the following sediments?silica; calcite


  12. Which of the following applies to the basic constituents of halite, gypsum, and sylvite?transported as dissolved ions; deposited by evaporation


  13. Coal beds originate in ________.freshwater coastal swamps and bogs


  14. What is the chemical formula for dolomite, the major mineral in dolostones?CaMg(CO3)2


  15. Oolitic limestone is most likely to form in what type of depositional environment?silica; calcite


  16. Which of the following best describes bedded gypsum and halite?transported as dissolved ions; deposited by evaporation


  17. Flint, chert, and jasper are microcrystalline forms of ________.quartz (SiO2)


  18. What is probably the single most important, original, depositional feature in sedimentary rocks?shallow, clear, marine waters with vigorous current activity


  19. Studies of deep-sea sediment cores have contributed greatly to scientific knowledge of ________.climatic changes during the last four million years


  20. ________ cement produces bright-red and yellow colors in some sandstone.Iron oxide