What are the two sources of energy that drive earth processes?

This word for a bug or malfunction was popularized in the 1962 book into orbit by the mercury astronauts

Rah is completing a school project on the expansion of fast food restaurants across the united states. she finds a map that shows a clear pattern of restaurants beginning in the east and expanding west. this map was most likely created using the technology of

Hurry on the map above, arrow 1 points to a region where most people are