Explain the concept of the water cycle.
The water cycle is like a big, never-ending adventure that water embarks on. It's all about how water moves around our planet, from the sky to the ground and back up again. The water cycle is composed of these simple steps:
Evaporation: It all starts when the sun beams its bright and warm rays on water, like in lakes, rivers, and even puddles. When this happens, the water gets so warm that it turns into tiny, invisible pieces called water vapour. Think of it like steam rising from a hot pot of soup.
Condensation: Now, imagine those tiny water vapour pieces floating up into the sky. Way up there, it's cooler, and the vapour starts to come together and form tiny water droplets. These tiny droplets are so small that they make clouds. So, clouds are basically made of lots and lots of tiny water droplets huddled together.
Precipitation: When those cloud droplets join together and get heavy enough, they start falling from the sky as rain, snow, sleet, or hail. This is what we call precipitation. It's like the clouds are giving us a drink or a sprinkle of water from above.
Collection: Rain or snow doesn't just disappear. It goes into our rivers, lakes, oceans, and even into the ground. This is where plants and animals get their water too. All this water collects in different places and forms big water bodies.
Transpiration: Besides rain, plants also play a part in the water cycle. They take up water from the ground through their roots and release it into the air through tiny holes in their leaves. This process is called transpiration, and it adds more water vapour to the sky.
Repeat: And the cycle goes on and on. The sun keeps shining, making more water evaporate, and the whole adventure starts again.
So, remember, the water cycle is like a big circle, with water constantly moving from the ground to the sky and back again. It's how we get the water we need to drink, and it's what keeps our planet's water balanced and healthy. Water residence time is long - a drop of water will spend >3000 years in the ocean before eventually making its way to our drinking water!