Why doesn't rain sink to the bottom of the earth?

Rain does not sink to the bottom of the Earth because of gravity. Gravity pulls raindrops towards the center of the Earth, causing them to fall downwards. Additionally, the Earth's surface is solid and impermeable, preventing rainwater from seeping through to the Earth's core. The water cycle also plays a role, with rain eventually evaporating back into the atmosphere to form clouds and fall again as precipitation.