Environmental Science
The areas where soil is washed away into streams, transported into rivers and finally lost to the sea are called

Biologically sensitive areas
Ecologically sensitive areas
Grasslands
Delta

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Environmental Science
During the winter solstice in the Northern Hemisphere:

Astronomical winter begins in the Northern Hemisphere
All of these
At middle latitudes in the Northern Hemisphere, this marks the longest night of the year
The noon sun is overhead at 23.5o S latitude

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