On my number line, 0 represents sea level. I made a vertical number line, so elevations above 0 are above sea level and elevations below 0 are below sea level.
▫ Sea level should represent an elevation of zero. So, the person sailing would be at zero because they are sailing on the surface of the water, which is neither above nor below the surface. On a number line, zero is the point or number separating positive and negative numbers.
Students watch a video showing the highest and lowest locations on each of the continents. Then they create a diagram (a number line) for a book titled The World’s Highest and Lowest Locations. Students show four of the highest elevations and four of the lowest elevations in the world on their diagrams.
Below sea level means to be below zero, which are negative numbers