Where is Earth's oldest known rock located? A. The Jack Hills region of Australia B. Yosemite National Park in the United States C. The floor of the Pacific Ocean D. The eastern shore of Hudson Bay in Canada

when the chinese communist party took power in 1949, it began to build new di and levees to hold the yellow and yangtze rivers back.

answer; the nazca plate is converging with the south american plate

an angle + its complement = 90 degrees