Above mean sea level

High school (ages 12+)
Geography

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/above-mean-sea-level

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the geoid?An equipotential surface of Earth's gravity field that approximates mean sea level
2. What is the measurement technologies?Includes tide gauges, spirit leveling, GPS, and satellite altimetry
3. What does "above mean sea level" mean?It is the height of a place measured from the average level of the ocean, which scientists use as a zero point for maps and building plans.
4. Why do scientists use mean sea level to measure height?Because the sea is everywhere around the world, so its average level gives a common reference that helps make accurate maps, navigation, and climate studies.

Geodesy: The science of measuring and understanding Earth's shape, orientation in space, and gravity field.
Vertical Datum: A reference surface or level used for measuring elevations and depths.
Tidal Gauge: An instrument used to measure the height of tides and sea level over time.