For example, when we drink water, the water gets out back into the ocean when we finish, then we get that water again from the ocean, is there a limit to how many times we can do this?
In: Earth Science
The water goes through a pretty well known cycle. Like you say, you use it, flush it away down the drain, and it goes to the ocean.
Then the sun shines on it, and the water evaporates into the atmosphere as moisture, winds blows the moisture over land, it forms clouds and it rains (and snows, etc). All that water in the rain collects in rivers and lakes, and you pump it out of there to drink it again. That cycle is extremely good at renewing the water.
it has been going on billions and billions of times, and will continue to go on for billions of more times. There is effectively no limit on how often this can happen.
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