What term or terms do historans use to refer to a general period of time

What border separates sonora and chihuahua national border state border physical boundary natural boundary

What conclusion can be drawn about the location of the city of syracuse? it was built on the coastline due to easy access to the red sea. it was built on the coastline due to easy access to the mediterranean sea. it was built inland to protect it from invaders sailing in from the mediterranean sea. it was built inland to protect it from invaders sailing in from the red sea.

How do the absence of sunspots affect earth climate