Environmental Science
The aurora is produced by:

Fast-moving charged particles colliding with air molecules
The combination of molecular and atomic oxygen to form ozone
Reflections of sunlight by polar ice fields
Scattering of sunlight in the upper atmosphere
Burning oxygen caused by the intense sunlight at high altitude

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Environmental Science
The earth is tilted at an angle of 23.5o with respect to the plane of its orbit around the sun. If the amount of tilt were increased to 40o, we would expect in middle latitudes:

No appreciable change from present conditions
Cooler summers and milder winters than at present
Hotter summers and milder winters than at present
Hotter summers and colder winters than at present
Cooler summers and colder winters than at present

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