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
Answer and Explanation
Answer:A
Explanation: No answer description available for this question.
17.

The largest glaciers are
A. mountain glaciers B. alpine glaciers
C. continental glaciers D. piedmont glaciers
Answer and Explanation
Answer:C
Explanation: The largest glacial bodies, ice sheets or continental glaciers, cover more than 50,000 km2 (20,000 mile2). Several kilometers deep, they obscure the underlying topography. Only nunataks protrude from the surface. The only extant ice sheets are the two that cover most of Antarctica and Greenland. These regions contain vast quantities of fresh water. The volume of ice is so large that if the Greenland ice sheet melted, it would cause sea levels to rise six meters (20 ft) all around the world. If the Antarctic ice sheet melted, sea levels would rise up to 65 meters (210 ft).
18.

The ionosphere includes
A. mesosphere B. thermosphere
C. thermosphere and exosphere D. thermosphere, exosphere and mesosphere
Answer and Explanation
Answer:C
Explanation: No answer description available for this question.
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
Answer and Explanation
Answer:A
Explanation: No answer description available for this question.
20.

The group of minerals chemically containing hydrocarbons is
A. silicate group B. organic group
C. oxide group D. hydride group
Answer and Explanation
Answer:B
Explanation: No answer description available for this question.