Page 7 - Curriculum Visions Dynamic Book

 The composition of Oxygen 21% clean air.
Noble gases 1% (helium, neon, argon, krypton and xenon)
Carbon dioxide 0.03%
Nitrogen 78%
aurora: the “northern lights” and “southern lights” that show as coloured bands of light in the night sky at high latitudes. They are associated with the way cosmic rays interact with oxygen and nitrogen in the air.
molecule: a group of two or more atoms held together by chemical bonds.
oxidise: the process of gaining oxygen. This can be part
of a controlled chemical reaction, or it can be the result of exposing a substance to the air, where oxidation (a form
of corrosion) will occur slowly, perhaps over months or years.
Also...
 An aurora forms a beautiful veil shape in the sky that is clearly visible at night.
Auroras
Auroras are bands of light that appear
in the night sky of high-latitude regions. The bands occur when cosmic rays reach the outer atmosphere, and in particular interact with the oxygen molecules.
The result is the production of crimson and greenish-white bands that form shapes like curtains moving across
the sky.
The pink and violet bands are caused by the effect of cosmic rays on the nitrogen in the atmosphere, but these are less prominent than the oxygen bands.
Oxygen is less common than hydrogen, helium, and neon in the Universe, but by far the most common element on the Earth.
It makes 90% of water
(by mass), about 47% of the Earth’s crust, as well as 23% of dry air and 65% of the human body.
 Almost all the oxygen present in the atmosphere
of the Earth was and is still formed by green plants as a byproduct of photosynthesis, which involves the conversion of carbon dioxide and water to glucose.
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