 For me, the water cycle begins in the ocean, and the reason is because the ocean is huge, it covers 70% of the earth's surface. And you may also know that the ocean is saline, or if you like, a little bit salty. So, the water cycle begins when evaporation occurs from the surface of the ocean. And when this evaporation occurs, only the water is removed from the ocean, and it leaves behind the salt. So, in regions where there's more evaporation than there is rainfall, what you find is that the surface of the ocean there becomes a little bit more saline. Once water does evaporate from the ocean, it stays in the atmosphere for about 11 days on average. After a while, it might condense into clouds, and then ultimately, it'll form as precipitation. And when it forms precipitation, that means it's going to fall somewhere on the surface of the earth. It might fall on the land. It might fall back into the ocean. It might fall in a mountain where it becomes incorporated into a glacier. It might be incorporated into the groundwater on the earth's surface. Or it might land on the Antarctic or Greenland where it forms part of an ice shield. No matter where the water falls, eventually it's going to end back up in the ocean. And this can occur through return flow, through rivers, or through glaciers. Or it can be stored on the land for a significant amount of time before it gets back to the ocean. The key thing about this whole water cycle, it really requires the latent energy that is needed to turn the water from liquid water up to water vapor, which allows it to evaporate from the ocean. And so, with climate change, we can expect there might be more energy around, and hence we may get more evaporation and an intensification of this whole water cycle.