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Table of Contents

Introduction References & Edit History Related Topics

Images

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Moonrise over Tucson, Arizona

Why Doesn’t Arizona Observe Daylight Saving Time?

Panoramic view at sunrise of moai, Ahu Tongariki, Easter Island (Rapa Nui), Chile

6 Lost Civilizations

airplane in flight (plane, aircraft, flying)

7 Puzzling Plane Disappearances

Close up of periodic table, focus on nickel, copper, zinc, palladium, silver, cadmium

When Was the Periodic Table Invented?

Statue of Liberty in front of the skyline of Manhattan, New York City, New York.

Who Was the Woman Behind the Statue of Liberty?

Camel at Khor Rori, Oman; mammal.

Do Camels Store Water in Their Humps?

Franklin D. Roosevelt, who formulated the Four Freedoms.

7 Alphabet Soup Agencies that Stuck Around

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Topics

mineral processing uraninite bauxite hematite laterite galena carnotite sphalerite scheelite banded-iron formation gossan placer deposit metallogenic province hydrothermal mineral deposit vein porphyry copper deposit nugget replacement deposit

Key People

Georgius Agricola.

Georgius Agricola

German scholar and scientist

Johan Vogt

Johan Herman Lie Vogt

Norwegian geologist

Quiz

James Watt as a young man, c1769. Scottish engineer and instrument maker. Invented the modern steam engine which became the main source of power in Britain's textile mills. His engine had a separate condenser in which steam from the cylinder; (see notes)

Weaponry, Energy, and Power Systems Quiz