| Explorer | Favorite Earth Fact | ||||
|---|---|---|---|---|---|
| Galileo | Earth is the 3rd planet from the sun and the 5th largest | ||||
| Magellen | Earth is between 4.5 and 4.6 billion years old | ||||
| Marco Polo | 71% of Earth's surface is covered with water | ||||
| Columbus | Earth has only one natural satellite, the Moon | ||||
| Sir Frances Drake | The atmosphere is made up of 78% nitrogen, 21% oxygen and 1% argon | ||||
| William Herschel | Earth's diameter is 12,756 km and its mass is 5.98 x 10^24 kg | ||||
| Lewis and Clark | The length of one day on Earth is 23 hours 56 minutes | ||||
| Scott and Amundsen | There are 365 days in an Earth year | ||||
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