Environmental Science
Bell-shaped polygonal pyramid indicates

low percentage of old individuals
high percentage of young individuals
low percentage of young individuals
moderate percentage of young individuals

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Environmental Science
Infrared and visible satellite images might provide:

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

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