The amount of water on Earth remains constant. But its form is always changing, from solid to liquid, from liquid to gas, and back again. It moves in a pattern called the water cycle. Heat from the sun causes water in oceans, lakes and rivers to evaporate into vapor. Further vapor is given off by plants and animals.

Animals are born in different ways. Some animals are egg-laying while some are born alive. Animals which lay eggs to the environment are birds, snakes, frogs, turtles, lizards and insects while animals which undergo gestation are born alive. Cats, cows, dogs, and whales are animals which are born alive

Weather is the continuous changing conditions of air around us. These changes can take many forms, including wind, rain, and snow. They influence how people live every day. When it rains or snows, many persons are often forced to stay indoors. Weather also affects one’s choice of clothes. One wears light clothes when the weather is hot and thick, close-fitting clothes when it is cold.