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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17. The largest glaciers are

A. mountain glaciers
B. alpine glaciers
C. continental glaciers
D. piedmont 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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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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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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