Clouds are fluffy shapes in the sky, but they are not made of cotton or smoke. They are made of many tiny drops of water floating in the air. Learning about clouds and rain helps children understand where puddles, plants, and drinking water can come from.
A simple cloud and raindrop picture shows an important part of the water cycle.
Understanding Early Learners: Clouds and Rain
The Sun is an important helper in rainy weather. It warms water in oceans, lakes, rivers, wet grass, and puddles. Some water then leaves the surface and mixes into the air as an invisible gas called water vapor.
This can happen even when a puddle seems to disappear without anyone touching it. On a warm day, wet clothes dry for the same reason.
The water has moved into the air. Air can hold some water vapor, but cooler air holds less than warmer air.
High in the sky, air is often cooler. As warm, moist air rises, it cools down. The water vapor then gathers around very tiny bits of dust, salt, or smoke in the air.
These tiny bits give the water a place to collect. This is why a cloud can form instead of the water simply staying invisible. A cloud may look soft and light, yet it contains a huge number of small drops.
Sometimes the air is cold enough for the water to freeze into tiny ice crystals. Different kinds of clouds can have drops, ice crystals, or both.
Clouds do not all bring the same weather. Thin, wispy clouds are often high up where the air is very cold. Low gray clouds can spread across much of the sky and may bring steady rain.
Tall clouds that grow upward can bring heavy rain, strong wind, thunder, and lightning. Children can begin to notice cloud shape, color, and movement. Dark clouds often look darker because they are thick and block more sunlight.
Wind pushes clouds across the sky, so their shapes can change quickly. Looking at clouds safely from the ground is a useful way to connect science with the weather outside.
Rain does more than make umbrellas necessary. It gives water to plants and helps seeds begin to grow. Some rain soaks into the ground, where it can reach plant roots or collect underground.
Some flows downhill into streams and rivers. After rain, puddles may slowly vanish as water returns to the air, beginning the cycle again. This movement of water from ground to air, from sky to ground, happens again and again.
When learning about it, pay attention to the change in water rather than thinking it has disappeared. It can be liquid in a puddle, invisible vapor in air, tiny drops in a cloud, or rain falling from the sky.
Key Facts
- Clouds are made of tiny water drops or tiny ice crystals.
- Water vapor cools and changes into tiny liquid drops to help form clouds.
- Tiny drops can join together to make bigger drops.
- When water drops get too heavy to stay in a cloud, they fall as rain.
- Rain helps fill lakes, rivers, soil, and puddles.
- More tiny drops joining together can mean bigger raindrops.
Vocabulary
- Cloud
- A cloud is a group of tiny water drops or ice crystals floating in the sky.
- Raindrop
- A raindrop is a drop of water that falls from a cloud.
- Water vapor
- Water vapor is water in the air as an invisible gas.
- Condensation
- Condensation is when water vapor cools and changes into tiny liquid water drops.
- Precipitation
- Precipitation is water that falls from clouds, such as rain, snow, sleet, or hail.
Common Mistakes to Avoid
- Thinking clouds are made of cotton. Clouds are made of tiny water drops or ice crystals, not soft fabric.
- Thinking rain falls because clouds break open. Rain falls when water drops in the cloud join together and become heavy enough to fall.
- Thinking every cloud makes rain right away. Some clouds have drops that are still too small and light to fall.
- Thinking raindrops start out huge. Raindrops often begin as very tiny drops that bump into other drops and grow.
Practice Questions
- 1 A small cloud picture has 8 tiny water drops inside it, and 5 more drops join them. How many tiny water drops are in the cloud now?
- 2 Three small drops join together to make one bigger drop. If 12 small drops join in groups of 3, how many bigger drops can form?
- 3 A cloud has many tiny water drops, but no rain is falling yet. Explain what must happen to the drops before rain can fall.