The concept of the distance is illustrated by the fact that as cost increases with distance, interactions between people decrease.
a: relativity
b: flexibility
c: erosion
d: friction

What evidence does the writer give to support his argument about coral reefs? a) he speaks of the activities of coral polyps. b) he describes the composition of the great barrier reef. c) he emphasizes the ways in which coral reefs are fragile. d) he points out the ways that scientists do research on the reefs.

Wegeners theory of continental drift states that the continents have changed throughout history while the theory of plate tectonics

Less developed nations have low literacy rates. true or false