How old is the china wall

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and brainleist !

The Great Wall of China was made during the Ming Dynasty ~2300 years ago.

It was made ~221 BC by Emperor Qing, who started the wall to defend China from the nomads of the north

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ww1 weapons: tank. tanks were used for the first time in the first world war at the battle of the somme. they were developed to cope with the conditions on the western front. the first tank was called 'little willie' and needed a crew of 3.

equal area projections

equal-area projection. a projection in which regions on the earth's surface that are of equal area are represented as equal.