Environmental Science
Our seasons are caused by:

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

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Environmental Science
The north-facing side of a hill in a mountainous region in the US tends to:

Have snow on the ground for a longer period of time in winter compared to the south-facing side
Be a better location for a ski run than the south-facing side
All of these
Grow a variety of trees that are typically observed at higher elevation
Receive less sunlight during a year than the south-facing side

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