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Posted by on Aug 21, 2017 in TellMeWhy |

What Is Tarmac?

What Is Tarmac?

Tarmac is a hard black material used for roads, parade grounds or anywhere that a hard, even and durable surface is needed. It is a mixture of tar (which accounts for...

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Posted by on Jan 10, 2016 in TellMeWhy |

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, much of the earth was swampy and flat. Huge...

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