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6. Which of these produces gas bubbles when it touches acid? a. shale b. all conglomerates c. humus d. limestone 7. What does the term permeability refer to? a. the hardness of soil b. the slope of soil c. the flow of water through soil d. the quality of the soil for use in farming 8. Which of the following is not an earth material? a. rock b. soil c. minerals d. clouds 9. If soil does not hold enough water, plants can _________________. a. grow larger b. stay the same c. dry up d. drown 10. The layers of a soil profile are called ______________________. a. pore spaces b. horizons c. textures d. bedrock 11. Minerals are _________________ substances found in the Earth’s crust. a. nonliving b. living c. effervescent d. coarse 12. Decayed plant or animal matter is called ____________________. a. minerals b. sedimentary rock c. humus d. bedrock 13. The ____________________ of a rock refers to the size of the sediment or minerals in the rock. a. effervescence b. luster c. color d. texture 14. When layers of sediment get pressed and cemented together, they become __________________________. a. igneous rock b. metamorphic rock c. sedimentary rock d. minerals 15. Which property of a mineral does the Mohs Scale measure? a. luster b. texture c. color d. hardness 16. According to the Moh’s Scale, _______________ is the hardest mineral. a. talc b. calcite c. quartz d. diamond 17. According to the Mohs Scale, _______________ is the softest mineral. a. talc b. calcite c. quartz d. diamond 18. What can pore spaces hold in soil? a. air only b. water only c. air and water d. humus 19. Conglomerate, which is made up of large sediments, such as pebbles, has a ______________ texture. a. smooth b. coarse c. hard d. nonliving 20. Which of the following are properties of minerals? Choose all that apply(4). a. color b. smell c. hardness d. streak e. taste f. luster