• Briefly describe how Earth’s axis is used as a reference for a system that identifies locations on Earth’s surface.
  • Explain why standard time zones were established. In terms of longitude, how wide is a standard time zone? Why was this width chosen?
  • Describe what happens to the minerals as shale is metamorphosed to slate, then schist, then gneiss. Is it possible to metamorphose shale directly to gneiss or must it go through the slate and schist sequences first? Explain.
  • Describe evidence that would explain why plate tectonics occurs on Earth but not on other planets.

 

 

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