How Far Is It to the Center of the Earth?
How Far Is It to the Center of the Earth? If you could drill a hole to the center of the Earth, you would find it measured about 3,958 miles (6,371 kilometers). The...
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How Did the Box Turtle Get Its Name?
How Did the Box Turtle Get Its Name? The box turtle (a North American land turtle) was so named because it has a hinged bottom shell that allows the shell to be closed...
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When Were Pencil Erasers Invented?
When Were Pencil Erasers Invented? Pencil erasers were invented in 1752 by a Frenchman named Magellan. He found that small lumps of caoutchouc (Kuchuk), as rubber was...
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What Is Scuba Diving?
Scuba diving is a mode of underwater diving in which a scuba diver uses a self-contained underwater breathing apparatus (scuba) to breathe underwater. Unlike other...
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Can People Make Rain Fall?
Can People Make Rain Fall? Yes, under special conditions, scientists can cause rain to fall. They can make rain only if clouds are present. The clouds must also be...
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How Can You Tell What Time It Is by Looking at the Sun?
How Can You Tell What Time It Is by Looking at the Sun? We know that the Sun moves across the sky during the day. Probably the simplest way to tell time is by knowing...
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How Can Lungfish Live out of Water?
How Can Lungfish Live out of Water? Most fish die if they are taken out of the water. However, the African lungfish (also known as the mudfish) can live for many months...
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What Is a Tornado and How Does It Form?
What Is a Tornado and How Does It Form? A tornado, or twister, is a violently rotating column of air that extends between the Earth’s surface and a cloud, usually...
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Why Are Some Puppets Called Marionettes?
Why Are Some Puppets Called Marionettes? There are different kinds of puppets – hand puppets, stick puppets, shadow figures, and marionettes. Marionettes, which...
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Why Do Termites Build Tall Mounds?
Why Do Termites Build Tall Mounds? The tall mounds built by certain kinds of termites that live in tropical climates are called termitaries. These mounds protect the...
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