Around 1800 (plus or minus about 5 years) is when it was estimated that the world's population had reached 1 billion.
Answer:
Panama
Explanation:
"Panama is a country on the Isthmus of Panama, the landbridge between the Caribbean Sea and the Pacific Ocean, that links North and South America. It is bordered by Colombia and Costa Rica."
When two oceanic plates collide, the younger of the two plates (because it is less dense)* will ride over the edge of the older plate. *(Oceanic plates grow more dense as they cool or move further away from the Mid-Ocean Ridge). The older, heavier plate bends and plunges steeply through the athenosphere, and descending into the earth, ir forms a trench that can be as much as 70 miles wide, more than a thousands miles long, and several miles deep.
Changes in the orbit of the earth caused the ice sheets to spread across Canada.
