Environmental Science
Suppose yesterday morning you noticed ice crystals (frost) on the grass, yet the minimum temperature reported in the newspaper was only 35o F. The most likely reason for this apparent discrepancy is that:

Temperature readings are taken in instrument shelters more than 5 feet above the ground
The thermometer was read before the minimum temperature was reached for that day
The newspaper reported the wrong temperature
The thermometer was in error
The thermometer was read incorrectly

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Environmental Science
The aurora is produced by:

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

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