Rivers and Lakes
- Of the three rivers below, which is longest?
- Lake Ontario is the source for which river?
- The course of which river features the world's highest waterfall?
- What is the world's second-largest lake?
- Which ocean features the greatest known depth?
| Did you know? For more than a billion Muslims around the world, Ramadan is a "month of blessing" marked by prayer, fasting, and charity. |