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

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

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Environmental Science
The lag in daily temperature refers to the time lag between the:

Minimum and maximum solar energy received at the surface for a given day
Time of minimum temperature and the time of maximum solar radiation
Sunrise and sunset
Time of maximum solar radiation and the time of maximum temperature
Minimum and maximum temperature for a day

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