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The base unit of time in the International System of Units (SI) and by extension most of the Western world, is the second, defined as about 9 billion oscillations of the caesium atom. The exact modern definition, from the National Institute of Standards and Technology is: "The second, symbol s, is the SI unit of time.
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The essential elements of geography you would want to look at to also study the weather of a region would be factors that most greatly impact weather patterns. This would include proximity to large bodies of water including large lakes, seas, and oceans and also the proximity to major water currents. In addition to this you would want to look at proximity to mountain ranges or elevation changes and specifically look at the elevation of a location. You also would want to look at the latitude of a location to determine the distance from the equator which will also greatly impact the weather and climate of a place. Generally you want to look at any factors that impact the weather based on a locations geography.
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Those are the top 3
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SUPERMARINE SPITFIRE, The Spitfire was the iconic aircraft of the Battle of Britain and became the symbol of British defiance in the air.
HAWKER HURRICANE
The Hurricane was the most numerous of RAF Fighter Command’s aircraft during the Battle of Britain, equipping 33 squadrons by September 1940
BOULTON PAUL DEFIANT
The Defiant was a two-seat fighter with a four-gun power-operated turret.