Environmental Science
Our seasons are caused by:

Only (b) and (c) are correct
The changing distance between the earth and the sun
The length of the daylight hours
All of these
The angle at which sunlight reaches the earth

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Environmental Science
Definition of ecosystem is

The community of organisms together with the environment in which they live
A community of organisms interacting with one another
The part of the earth and its atmosphere which inhibits living organisms
The abiotic component of a habitat

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

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