Answer:Based on the water cycle, the water supply on Earth will not run out. Here's why: The water cycle is a closed system. This means that the total amount of water on Earth remains relatively constant. Water is constantly being recycled through evaporation, condensation, precipitation, and runoff. While the distribution of water (where it is located – oceans, ice caps, groundwater, etc.) can change, and the availability of fresh water is a serious concern, the total amount of water itself is not diminishing. Why the concern about water scarcity then? The problem isn't a lack of water overall, but rather: - Uneven distribution: Water is not evenly distributed across the globe. Some areas have abundant water resources, while others experience severe droughts. - Pollution: Pollution contaminates water sources, making them unusable for drinking and many other purposes. - Overuse and unsustainable practices: Human activities, such as excessive irrigation and industrial water use, deplete groundwater supplies and strain surface water resources faster than they can replenish. - Climate change: Changes in weather patterns due to climate change are altering precipitation patterns, leading to more frequent and intense droughts in some areas and floods in others. In summary, while the Earth's total water supply is finite and not being depleted by the water cycle itself, the availability of fresh, clean water for human use is a major concern due to human activities and environmental changes.