Lesson Notes By Weeks and Term v4 - Basic 4

Lesson Video

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Performance objectives

• Define what a cycle is
• Describe the stages of the water cycle
• Illustrate the life cycle of a butterfly
• Recognize the importance of cycles in the environment

Lesson summary

This lesson introduces learners to a very important natural process called the Water Cycle. Water is essential for all life. We use it every day in Ghana for drinking, cooking, bathing, and farming. Have you ever wondered where the rain comes from, or where the water in a puddle goes when the sun shines? The water on Earth is constantly moving and changing form in a continuous journey. Understanding this cycle helps us appreciate our environment, the importance of our rivers and lakes, and why we have rainy and dry seasons. This knowledge is crucial for understanding weather, agriculture, and the need to conserve our water resources.

Lesson notes

The water cycle is the path that all water follows as it moves around our planet. It has no starting or ending point—it’s a continuous loop. Think of it as a big journey that water takes over and over again. This journey has four main stages.

Stage 1: Evaporation (Water goes UP) What it is: Evaporation is the process where a liquid, like water, turns into a gas. This gas is called water vapour. Water vapour is invisible; you cannot see it. How it happens: The Sun provides the energy for evaporation. It heats up the water in our oceans, lakes, rivers (like the River Volta), and even small puddles on the road. As the water gets warmer, it changes into water vapour and rises up into the air. Ghanaian Example: Think about a sunny day in Accra after it has rained. You see puddles of water on the ground. After a few hours in the hot sun, the puddles are gone. Where did the water go? The sun’s heat turned the water into water vapour, and it went up into the air. This is evaporation. It is also why your wet clothes dry when you hang them on the line outside.

Stage 2: Condensation (Clouds are FORMED) What it is: Condensation is the process where water vapour (a gas) cools down and turns back into tiny liquid water droplets. How it happens: As the invisible water vapour rises higher into the sky, the air gets much colder. This cold air causes the water vapour to change back into tiny little drops of water. These tiny drops are so light they float in the air. When millions of these tiny drops clump together, they form clouds. Ghanaian Example: Have you ever bought a cold bottle of FanYogo or a sachet of pure water on a hot day? You will notice that the outside of the bottle or sachet becomes wet. This is not because the container is leaking! The water vapour in the warm air around the bottle touches the cold surface, cools down, and turns back into liquid water. This is exactly what happens high in the sky to form clouds.

Stage 3: Precipitation (Water comes DOWN) What it is: Precipitation is any form of water that falls from the clouds to the Earth. How it happens: The tiny water droplets inside a cloud continue to bump into each other and join together, becoming bigger and heavier. When they become too heavy to float in the air anymore, they fall to the ground. Ghanaian Example: The most common form of precipitation in Ghana is rain. During the rainy season, the clouds become very full and heavy with water, and it rains for many days. This rain gives water to our farms so that crops like maize, cassava, and yam can grow. Other forms of precipitation, which are not common in Ghana, are snow, sleet, and hail.