What Makes Thunder?
What Makes Thunder? A bolt of lightning is a big electric spark. During a thunderstorm, electrical charges are built up in the clouds. When
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Heat
What Keeps an Igloo Warm Inside?
What Keeps an Igloo Warm Inside? If you were an Eskimo living in the far north of Canada, you might build your winter house from blocks of s
What Makes the Bubbles Form When Water Boils?
What Makes the Bubbles Form When Water Boils? When you boil water in a tea-kettle, you heat it to the point where it changes from a liquid t
How Do Microwave Ovens Work?
How Do Microwave Ovens Work? In a microwave oven, you can cook a hamburger in only four minutes. Conventional ovens cook food by heating air
How Is Coal Formed?
How Is Coal Formed? Coal comes from plants that have been buried in the earth so long, they turned hard and black. Millions of years ago, mu