1. Which point in the ocean is the lowest in the world? What is its elevation?
2. Which mountain is the highest in the world? What is its elevation?
3. If you plot the elevations of the mountains and trenches on a vertical number line, what would 0 represent? What would points above 0 represent? What about points below 0?
4. Which is farther from sea level: the deepest point in the ocean, or the top of the highest mountain in the world? Explain.