What important discovery about the flatness of the ocean's surface did scientists make using satellite surveys?

How does the brandt line, walt rostow's modernization model, neocolonialism, and walterstein's world systems theory inform and intersect with each other when explaining economic development?

Stages 1 and 4 of the demographic transition are similar in that

The vegetation that thrives in the tundra is limited to a. mosses, barley, wheat, and corn. b. coniferous trees. c. dwarf shrubs, mosses, lichen, potatoes, and beans. d. mosses, lichen, algae, and dwarf shrubs.