| A | B |
| astrolabe | a tool that measures the height of the sun or a star above the horizon |
| caravan | a group of people and animals who travel together |
| circumnavigate | to sail completely around something |
| conquistador | the Spanish word for conqueror |
| colony | an area of land ruled by another country |
| convert | to change a religion or a belief |
| expedition | a journey to achieve a goal |
| epidemic | an outbreak of disease that spreads quickly and affects many people |