Asked in Landforms
What is Land Surface Datum?
Land-surface datum is a datum plane that is approximately at land surface at each well. If known, the elevation of the land-surface datum above sea level is given... Datum: any level surface, line, or point used as a reference in measuring elevations. ...
Asked in Science, Astronomy, Earth Sciences
Why are tides more noticeable in Earth's oceans than on its land?
Tides in the ocean can cause variations in surface elevation of 50 feet or more between high tide and low tide. Also, being liquid, the sea flows from one place to another. Tides on land seldom exceed 6 inches in amplitude, and the land doesn't flow. ...
Asked in Earth Sciences, Geography
What is the average elevation of earth's land surface?
The average elevation of all Earth's surface is slightly above sea level at this time in Earth's history. Most of the earth is covered by water at an average depth of 3.8 kilometers (2.4 miles). ...
Asked in Geology
Land with a broad base that rises sharply into a peak from the land around it?
A mountain is a land form with a broad base that rises sharply into a peak. It is a large natural elevation of the surface of the Earth. ...
Asked in Animal Life, Peru
How does Peru's elevation affect it's temperature and surface currents?
The higher up in elevation a place is, the colder it will be. As for surface currents, I have no clue. ...
Asked in Science
How do index contours let you know if the land you are viewing are increasing or decreasing?
Each index contour has an elevation associated with it. When you look at 2 contours, one will have a higher corresponding elevation. As you go from the lower elevation to the higher elevation, you know that the land is increasing in the direction toward the higher elevation. From the higher to the lower elevation, the land is decreasing (sloping downward, decreasing in elevation). ...
Asked in Earth Sciences
What is land subsidence and how does it occur?
A drop in the elevation of the surface of the land is called land subsidence, and can be caused by a collapse of underground mining shafts or naturally occurring underground cave system collapses, commonly called sinkholes. ...
Asked in Deserts
Why does a well watered piece of land appear in the middle of the desert?
In some areas of the desert, where the surface is quite low in elevation, ground water may reach the surface as a spring and form an oasis. ...