How is Europe connected? a.
extensive railways
c.
common communication systems
b.
the Chunnel
d.
all of the above

Arid and semiarid subcategories are part of which climate

One of the main reasons societies settled along rivers in the neolithic era was because a) the village elders demanded it. b) the land there was more valuable. c) it was more safe and secure there. d) it provided irrigation for farming.

How many time zone are there on earth