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Most natural diamonds are formed at high temperature and pressure at depths ........................ 200 kilometers below the earth's surface.

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It is thought that the Shoshone people of what is today the Canadian province of Alberta have dominated the region thanks to their acquisition of horses.

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By 1815, London had become the larger city in the world, with perhaps the world's most diverse population.

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Wood ............. by human beings for thousands of years both as fuel and as a construction material.

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Between major cities of the USA,  San Francisco has the coolest summer temperatures, mainly because of the winds that blow in from the North Pacific.

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Denver .............................. the "Mile-High city" because its official elevation is exactly one mile or 1,610 meters.

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It wasn't until the invention of the marine clock in the 18th century .............................. possible to measure longitude with any accuracy. 

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We can only detect about 5% of the matter of the universe. The rest is made up of invisible matter, called dark matter, and a mysteriously form of energy known as dark energy.

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Despite being considered mad by his contemporaries, William Blake is today held in high regard by literary critics for his creative and expressiveness.

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The world record for the longest hang-gliding  ........................ by American Dustin Martin, is an astonishing 765 kilometers.