What's New Read the factual text: Clouds are collections of millions of water droplets or ice crystals. They are formed high above the Earth's surface and sometimes at ground level. The three main forms of clouds are cumulus, stratus and cirrus. Their shapes are clues to predicting weather. Cumulus clouds are puffy with broad, flat bases. A few small cumulus clouds signal fair weather. But tall, bulky cumulus clouds are called cumulonimbus can produce thunderstorms. Stratus clouds are flat, sheet like clouds. They normally mean warm or possibly wet weather. Cirrus clouds are wispy clouds found at great heights. Full of ice crystals, these clouds often indicate stormy weather. So the next time you leave the house, look up the sky, observe the clouds and find out whether you will bring an umbrella or pack up a raincoat. Comprehension Check Up Answer the following questions: 1. What does the text about? 2. How are the clouds formed? 3. What are the main three forms of clouds? 4. Describe the cirrus clouds.
