Environmental Science
Euro II standard refers to _________

Increasing sulfur content in fuel
increasing carbon content in fuel
Lowering sulfur content in fuel
Lowering carbon content in fuel

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Environmental Science
Low clouds retard surface cooling at night better than clear skies because:

The clouds absorb and radiate infrared energy back to earth
The water droplets in the clouds reflect infrared energy back to earth
The clouds start convection currents between them
The formation of the clouds releases latent heat energy
The clouds are better conductors of heat than is the clear night air

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Environmental Science
Infrared and visible satellite images might provide:

A way of determining cloud thickness and altitude.
A way of distinguishing between wet and dry clouds.
A way of distinguishing between "new" and "old" clouds.
A way of identifying clouds suitable for cloud seeding.

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