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Coordinate planes
The coordinate axes are labelled with Indo-Arabic numerals so, to avoid confusion, Roman numerals are used for whole planes.
The first airplanes where used as private planes until the military required there services and where used as recon planes during the World Wars.
It's called a pirouette.
Yes, extensively. And WWI was the first war in which air planes were used.
An Acheulian is someone who was alive during a lower Paleolithic period, a time in which the first hand axes were used.
200,000 worldwide
No. They didn't have planes. But they did have observation balloons.
A movement used in dressage and ballet, is the Pirouette.
Axes -- ice axes in particular -- are used in ice work, either as a utility tool or as a survival tool.
planes boats tanks
x, y and z axes.