Monthly Archives: September, 2012

What is the difference between a lake and a pond?

Generally, a pond is described as a small body of still water without an outlet.  Lakes are usually much larger and deeper and often are fed by rivers and streams. Generally, lakes differ from ponds in size.  A lake is commonly descried as a large body of water with land all around it. A pond …

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What makes a railroad crossing signal go on?

Train crossing signals are worked automatically by electricity made to flow when the train’s wheels touch certain sets of rails near the crossing. People walking or riding need to be warned at an approaching train when they are about to cross the tacks on the highway. Safety gates may close.  Electrically operated waving arms and …

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What is the biggest desert?

The Sahara desert of North Africa is the Largest desert in the world.  It is nearly as big as the whole united states. Almost as large as the whole United States, the Sahara stretches across the northern part of Africa from the Atlantic Ocean to the Red Sea. The Sahara desert is a vast, sunbaked …

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What do we mean by Latin America?

We often use the name “Latin America” when speaking of countries located South of the United States.  It  comes from the fact that these countries were settled largely by the Spanish and Portuguese, and  as a result, have many of the Latin Cultural traditions. The term includes Mexico, Central America, South America, and most of …

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What is oil shale?

Oil shale is a kind of rock that contains kerogen, a waxy substance that gives off liquid when heated.  Not all oil comes from oil wells that bring oil up from underground pools. Much of the world’s supply of oil is  found in a kind of rocks formed of tightly packed clay, mud and slit.  …

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