Solution:
Tides are the short term periodic rise and fall of the world's oceans. They are due to the combined effects of gravitational attraction and the revolution of the Earth-moon system about its common centre of mass.

Solution:
The Commonwealth of Independent States (CIS) had its origins on December 8, 1991, when the elected leaders of Russia, Ukraine, and Belarus (Belorussia) signed an agreement forming a new association to replace the crumbling Union of Soviet Socialist Republics (U.S.S.R.).

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The process of particle detachment by moving glacial ice is called plucking.

Solution:
All of the above

Solution:
The heavy day soils that show significant expansion and contraction due to the presence or absence of moisture is called vertisols.

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The phenomenon of an opening occurring in the earth's surface through which a jet of hot water and steam is forces out at irregular intervals is called geyser.

Solution:
Absolute extremes are the highest and lowest values of a weather element observed over the entire period of record.