Why Does It Rain?

Have you ever looked up at the sky and wondered why water suddenly falls from the clouds? Rain does not appear by magic. It is part of a big journey that water takes again and again on Earth. On warm days, the sun heats up water in rivers, lakes, seas, and even small puddles on the ground. When water gets warm, it slowly changes into an invisible gas called water vapour. This water vapour rises into the air and floats higher into the sky. This process is called evaporation.

High up in the sky, the air is much cooler. When warm water vapour reaches this cooler air, it turns back into tiny drops of water. These tiny drops gather together and form clouds. Although clouds look soft and light, they are made of millions of tiny water drops.

Inside the cloud, the drops keep bumping into one another. As they join together, they become bigger and heavier. When the drops become too heavy to float in the air, gravity pulls them down to Earth as rain. Sometimes the drops are small, so we get light rain or drizzle. Other times, the drops grow very large, and rain falls quickly and heavily. This is why rain can feel gentle on one day and very strong on another.

Rain is very important for life on Earth. Rain helps plants grow by giving them the water they need to make food and stay healthy. When rain soaks into the soil, it helps roots grow deeper and keeps leaves and flowers strong.

Rain also fills rivers and lakes. When rain falls on land and mountains, the water flows into streams, rivers, and lakes, keeping them from drying up. These rivers and lakes provide homes for fish and animals and supply water for many living things.

Rain also helps people collect water in reservoirs. Reservoirs store rainwater so families have clean water to drink, cook, and wash with, even during dry days. Without enough rain, reservoirs can run low, and people may not have enough water to use.

WhyPals asks: Why do you think rain is important for both plants and animals?