he would mention

April 22 is the yearly Shown by the data .
too many and tin no memorize to jot an! remember which number it ?
asked geologist , he would say : remember the geological age of the Earth 4.6 billion years . can astronomers say: it is too short , or remember the astronomical old of the Earth 60 million annuals .
asked anthropologist , he would say : remember that life on Earth is 300 million years of period . can be Demographers may ask : so long? or remember the Earth 's aggregate population now 67 million people .
land scientists asked , he would say : Remember that the Earth's surface place is 510 million square kilometers , of which the land The total space is 149 million square kilometers , accounting as 29.2% of the total space of ​​the earth . can oceanographers say , that ratio is too small , or remember the ocean is 361 million square kilometers of total area , accounting for 70.8% of the total area of ​​the earth .
queried physicist , he would mention : Remember namely the volume of the globe namely 1.1 trillion cubic kilometers , the Earth's hunk is 600 million million million tons, the mean density of Earth's 5.52 grams per cubic centimeter . 's School preceptor said , Do not need to remember so many, fair remember namely the Earth's surface gravity is 9.8 meters per square seconds ashore the line .
asked mountaineering scientist , he would say : remember the Earth's land , the average altitude of 875 meters , the maximum point is Mount Everest 8848 meters tall . undersea scientists can say that it is too tall , alternatively the average depth of the sea to remember the Earth is 3729 meters , the deepest point is Maria Daytona Goushen 11,033 meters .
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file almost the Earth Too numerous! older, and these numbers are too complex, hard to remember. There is no uncomplicated point ?
son smiled : 1 simple, easy to remember .
Yes! to remember this number 1 now!
we have merely one earth, one with our students take nice care of it, to attach to it immediately !