What Is Sea Level?
We say that Mount McKinley in Alaska is 20,320 feet above sea level, or that Death Valley, in California, is 282 feet below sea level. And w
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Measurements
How Do We Measure the Height of a Mountain?
How Do We Measure the Height of a Mountain? Most of our figures for mountain heights were obtained with an “altimeter.” This is kind of baro
What Is Local Mean Sea Level?
What Is Local Mean Sea Level? Sea level is the base level for measuring elevation and depth on Earth. Because the ocean is one continuous bo
How Do Scientists Measure the Depth of the Ocean?
How Do Scientists Measure the Depth of the Ocean? Historically, before scientists developed new techniques, the depth of the ocean was actua
How Much Does the Earth Weigh?
How Much Does the Earth Weigh? Scientists estimate that the Earth weighs about 7 sextillion tons! To get an idea of what that number looks l