21.

The reaction between compounds and oxygen is called
A. oxidation B. hydrolysis
C. carbonation D. solution
Answer and Explanation
Answer:A
Explanation: No answer description available for this question.
22.

The percentage of sun's radiation reflected back into space is about
A. 36 percent B. 47 percent
C. 17 percent D. None of the above
Answer and Explanation
Answer:A
Explanation: No answer description available for this question.
23.

The progressive wave theory regarding of tides was put forth by
A. R.A. Harris B. Issac Newton
C. William Whewell D. G.B. Airy
Answer and Explanation
Answer:C
Explanation: No answer description available for this question.
24.

The original founders of Common wealth of Independent States, in December 1991, are
A. Tadjikistan, Khirghizia and Turkemenistan B. Armenia, Georgia and Azerbaijan
C. Russia, Ukraine and Byelorus D. Moldavia, Khazakhastan and Uzbekistan
Answer and Explanation
Answer:C
Explanation: No answer description available for this question.
25.

The Pyrenees mountains are located on the border between ____ and ____
A. Romania, Bulgaria B. Norway, Sweden
C. Hungary, Romania D. France, Spain
Answer and Explanation
Answer:D
Explanation: No answer description available for this question.