| 16. | The groundwater can become confined between two impermeable layers. This type of enclosed water is called |
| a. | artesian |
| b. | artesian well |
| c. | unconfined groundwater |
| d. | confined groundwater |
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Answer: (a).artesian
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| 17. | The largest glaciers are |
| a. | mountain glaciers |
| b. | alpine glaciers |
| c. | continental glaciers |
| d. | piedmont glaciers |
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Answer: (c).continental glaciers
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| 18. | The ionosphere includes |
| a. | mesosphere |
| b. | thermosphere |
| c. | thermosphere and exosphere |
| d. | thermosphere, exosphere and mesosphere |
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Answer: (c).thermosphere and exosphere
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| 19. | The highest degree of concentration of mineral deposits are found in |
| a. | northeastern zone |
| b. | northwestern zone |
| c. | southern zone |
| d. | All of the above |
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Answer: (a).northeastern zone
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| 20. | The group of minerals chemically containing hydrocarbons is |
| a. | silicate group |
| b. | organic group |
| c. | oxide group |
| d. | hydride group |
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Answer: (b).organic group
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