What was unique about the physical geography of the Oaxaca Valley? It contained a vast system of caves.
o It sat on top of an active volcano.
It sat thousands of feet above sea level.
O It contained mostly swamps and jungles.

It Sat on top of an active Volcano

Explanation:

I'm pretty sure it is B.) It sat on top of an active volcano

Explanation:

Edge 2021 :)

c) troops march forward in close formation against newer, more accurate weapons

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