4.) PLATE TECTONICS Mt. Everest 8850 meters 292% Avg elevation of g depth of oce
ID: 117488 • Letter: 4
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4.) PLATE TECTONICS Mt. Everest 8850 meters 292% Avg elevation of g depth of oceans 3729 meter Deeo ocean Trenches Ocean 708% 10 Percent of Earth's Surface 50 100 150 200 20 300 350 400 450 500 100 20 40 60 80 Percentage of area Percentages of the Earth's surface at different elevations are plotted above. This is called the Hypsographic Curve. a.) Why are there two elevations that cover so much of the surface of the earth (why is there a b.) Why is there so much of the earth's surface at or near sea-level? (3 points) c.) Why haven't the tallest mountains (eg. the Himalayas) eroded down to sea-level? Why bimodal distribution of elevations)? (4 points) haven't the deepest ocean trenches (e.g, the Mariana Trench) filled up with sediment? (3 points)Explanation / Answer
a) The two elevations in the histogram belong to the average elevation of the continents and the abyssal planes which cover up most of the oceans. The continents average elevation is 840 meter which cover up most of the continents. The abyssal plain is realtively flat surface of the ocean which is covered by sediments. These abyssal plains make up almost 24% of the earth's surface (according to the curve)
b) The Earth's surface is mostly at or near se level because relatively earth is a flat land (plain). Mountains make up only small percent of the landscape. The ancient mountains would hae been eroded by wind or water or any other elements.
c) Himalayas as of now has not been eroded. This will take a geological time frame (millions of years) to erode the mountains. The himalayas is fairly younger (50 million years), so by the time these gets eroded, planet Earth will have a new face.
Same as the erosion, sedimentation also take place very slowly in the geological time frame. the trenches are very deep, hence the voulume of sediments should be large enough and these sediments will take millions of years to travel from land to the ocean and also other sources
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