RIELF MAP

How do we measures of sea levels?
An accurate measurement of sea level is very hard to pin down. But it is an important measurement for two main reasons:

• By having an accurate sea level measurement, it is possible to measure the height of everything on land accurately. For example, calculating the height of Mt. Everest is complicated by sea-level measurement inaccuracies.
• By knowing sea level, we can determine if the oceans are rising or falling over time. The concern is that global warming and other weather changes caused by man might be leading to an overall rise in sea level. If so, coastal cities are in big trouble.

EXAMPLES
San Fransico (USA)
Sydney (AUSTRALIA)
New York (USA)Santa Monica (USA)
Toronto (USA)