23.The water cycle is also
known as horological cycle.
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The water cycle is also known as the hydrological cycle.

Explanation:

The water cycle, or hydrological cycle, is a cycle that involves the water (in ints three conditions) and its movement throughout the spheres. This cycle goes through the atmosphere, geosphere, hydrosphere, and biosphere. The water is crucial for pretty much everything on Earth, so it is used or manages to influence a lot of things.

Basically, the cycle goes like this:

i'm sure the answer you are looking for would be

a. an ice age

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