Answer:
It looks like children working in a coal mine so i guess Gases, Mines could collapse, and possibly get sick from fumes or something.
Answer:
A civilization is a complex culture in which large numbers of human beings share a number of common elements. Historians have identified the basic characteristics of civilizations. Six of the most important characteristics are: cities, government, religion, social structure, writing and art.
Explanation:
Answer:
The use of the abacus was expanded and refined.
Explanation:
The abacus was invented during the Yuan Dynasty which lasted between 1206AD till 1368AD and then it was expanded and refined by the Ming Dynasty (1368AD-1644AD).
There have been archaeological proof of this as the writings of Tao Zongyi describes in his book that the new servants, unlike the older and more experienced ones were "just like abacus heads" and that they would not move unless they were made to move. This bears credence to the fact that the abacus was already widely used then.
An abacus was used to count numbers.
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The Prussian state power dominated the nation building process in Germany. The key role was played by Otto von Bismarck, its chief minister with the help of Prussian army.
There were three wars over 7 years with Denmark, Austria Hungary and France between 1864 and 1871 which ended in Prussian victory.
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The Southerners opposed industry because their main revenue came from exported crash crops grown in plantations. The Southerners saw no need to incorporate industry since they thought it would not be useful at all.
