From the options above, the right answer about cyclic changes is b. small continents merging to become a supercontinent
A supercontinent cycle is the quasi-periodic accumulation and dispersion of the Earth's continental crust. Opinions differ as to whether the amount of continental crust is increasing, decreasing, or remaining roughly the same, but the consensus is that the Earth's crust is constantly restructuring. A complete supercontinent cycle is said to take 300 to 500 million years. Continental collision reduces the number of continents and makes them larger, while rift increases the number of continents and makes them smaller. The most recent supercontinent, Pangaea, formed about 300 million years ago.
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