River valley trade made them key economic areas.
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Answer:
On Pluto, where the winter lasts for half of the nearly 250-year orbital period, temperatures undoubtedly do drop to such low values. On the Earth and other planets with an atmosphere, so-called greenhouse gases can trap part of the heat radiated by the surface, keeping the surface warmer.
Explanation:
-1 on which axis? Is this all the information given in the question?
Answer:
To describe and summarize spatial data. To make generalizations concerning complex spatial patterns, to use samples of geographic data to infer characteristics for a larger set of geographic data (population).
Explanation:
