FACTOID # 31: Almost half of Ecuador is subject to environmental protection.
 
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Encyclopedia > 5600 BC

(7th millennium BC6th millennium BC5th millennium BCother millennia)


Events

Inventions, discoveries, introductions

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  Results from FactBites:
 
Concrete and paving history - ancient times 540 A.D. (321 words)
12,000,000 BC A natural deposit of cement compounds forms due to the reactions between limestone and oil shale during spontaneous combustion near present-day Israel.
5600 BC The first concrete structures were built.
3000 BC The Egyptians began to use mud mixed with straw to bind dried bricks.
  More results at FactBites »


 
 

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