Notebook Work: Label the top of your notebook page with "LESSON 21." Refer to the map and write the answers to the below questions in your notebook. Make sure to number your answers.

1. Which ocean do people cross when they travel from North America to Europe?

2. Which ocean do people cross when they travel from eastern Asia to western America?

3. Nearly all the natural rubber used in North America for automobile tires, overshoes, erasers, and hundreds of other articles comes from South America. Over which oceans might it come?

4. Robert E. Peary, an American, traveled the North Pole on April 6, 1909. On what ocean did Peary sail on his journey to the North Pole?

5. Roald Amundsen, a brave Norwegian, reached the South Pole on December 14, 1911. When Amundsen searched for the South Pole, he started from an island near Australia. On what oceans did he sail?

6. When the first slaves were brought to North America from Africa over what ocean did they come?

7. What ocean trip is shortest from Africa to Asia?

8. Of what use is the ocean?

9. Which ocean can you reach most quickly from your home? How long would it take you to get to this ocean?

10. How long would it take you to reach the Pacific Ocean from your home?