15
Lesson 15 of 84 · Regions
Industries of the Northeast
Coral reefs, built by tiny polyps, are underwater ecosystems. The Great Barrier Reef, the largest living structure on Earth, supports thousands of marine species.
Key Facts
1
Climate differs from weather.
2
Natural resources are limited.
3
Geography affects how people live.
Check Your Understanding
Question 1
1 of 2What does a physical map show?