Infrastructure maintenance applies to the fundamental facilities and systems serving a country city or area such as transportation and communications systems, power plants and schools.
true or false

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.

What are two australian geographical features that hindered early exploration? western plateau gulf of carpentaria great barrier reef great dividing range

Acanyon on the ocean floor at which the crust bends downward is called a(n)