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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
What Is Acid Rain?
Acid rain is created when rain mixes with pollution in the air. Pollution fills the air with an invisible gas called sulfur dioxide. (This…
The Vandalizing Visitor
It was late at night at the Drakemore Hotel. A member of the cleaning staff was dusting the courtesy phones in the lobby when…
Why Does a Train Whistle Change Its Pitch When It Passes?
Why Does a Train Whistle Change Its Pitch When It Passes? You may have noticed that the pitch of a train whistle seems to…
How Does an Anchor Hold a Ship?
How Does an Anchor Hold a Ship? The weight of a simple cement-can anchor can keep a fisherman’s small boat from drifting away. The…