Around 1800 (plus or minus about 5 years) is when it was estimated that the world's population had reached 1 billion.
Ocean plate because it is more dense
To be frank, I don't think your question is specific enough, but I would say that the answer would be the Rocky mountains, or just mountains. those are the only major kinds of landforms I can think of
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Ecuador & Columbia
Both are Bordering Peru in the North.
