Where does a halo occur, and what does one look like?
A ring of light surrounding the sun or moon could indicate a halo or a corona.
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For which of the following pairs are the atoms most likely to form an ionic bond with each other?
A) carbon and oxygen B) calcium and chlorine C) chlorine and oxygen D) sodium and magnesium
How do gradient, discharge, channel size, and channel roughness typically change from the head to the mouth of a stream?
What will be an ideal response?
The lower snowline of the past meant that
A) glaciers existed at lower altitudes. B) there were fewer glaciers. C) there were glaciers at lower latitudes. D) on average, there was less snow than there is today.
By 2025, demographers predict that what percentage of the world will be living in urban areas?
A) about 60% B) approximately 30% C) at least 50% D) a little less than 70% E) almost 90%