World facts, geography, history.
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Mohenjo-daro and Harappa were major Indus Valley cities.
The civilization flourished in South Asia.
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The First World War began in 1914.
It ended in 1918.
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The cerebellum coordinates movement, posture, and balance.
It lies at the back of the brain.
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Recycling processes used materials into new products.
It can reduce waste and demand for raw resources.
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Athens developed an early form of citizen democracy.
Participation was limited compared with modern democracy.
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The Second World War began in Europe in September 1939.
Germany's invasion of Poland triggered declarations of war.
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Human body cells normally contain 46 chromosomes in 23 pairs.
Reproductive cells contain 23 chromosomes.
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Erosion removes and transports soil or rock.
Water, wind, ice, and gravity can cause it.
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The ancient Olympic Games were held at Olympia in Greece.
They were connected with Greek religious festivals.
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The League of Nations was established after the First World War.
It was later replaced by the United Nations.
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Sunlight helps the skin produce vitamin D.
This vitamin supports calcium absorption and bone health.
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The joule is the SI unit of energy and work.
It is named after James Prescott Joule.
