The figure above shows an upper-level 500 mb weather map drawn over North America. What are the lines on this map called?
a. geopotential height contours
b. elevation contours
c. isotherms
d. isobars
a. geopotential height contours
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How do geologists know how to determine half-lives and decay-rates?
What will be an ideal response?
The relationship between weathering and erosion can best be characterized as
A. weathering loosens material after erosion has carried it away, but erosion can also scour and move unweathered material. B. weathering loosens material before erosion carries away, but erosion can also scour and move unweathered material. C. weathering must happen before erosion can occur. D. weathering must happen once erosion has moved material.
Which of these nations is thought of as NAFTA's "silent" partner?
What will be an ideal response?
Mercury is so toxic in all its forms that it is no longer used except as a poison, as in fungicides.
Answer the following statement true (T) or false (F)