How Do Clouds Change Shape?
How Do Clouds Change Shape? Clouds are made mostly of tiny droplets of water floating about on currents of air. On a windy day, the air curr
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Floating
What Are Icebergs?
What Are Icebergs? An iceberg is a mountain of ice floating in the sea. It was once part of a glacier. In many places glaciers flow right do
Why Does Ice Float?
Ice is able to float because it is lighter than water. Water greatly expands as it freezes into ice. Ten quarts of water produce about eleve
How Is Glass Made?
Ordinary glass is made from clean, white sand and two white, powdery chemicals known as soda and lime. Just plain sand can be made into glas
How Does a Submarine Go up and down?
A submarine is different from other ships, though, because it can control its buoyancy. This means the submarine captain can decide when to