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The Mach number (M or Ma), often only Mach, (/ m ɑː k /; German:) is a dimensionless quantity in fluid dynamics representing the ratio of flow velocity past a boundary to the local speed of sound. [1] [2] It is named after the Austrian physicist and philosopher Ernst Mach. =, where: M is the local Mach number,
Themed “Our Shared Home,” this year’s Call to Earth Day focuses on bridging the gap between humans and wildlife. Over 200,000 participants, including 235 schools, took part this year.
Scouts BSA Handbook is the official handbook of Scouts BSA, published by the Boy Scouts of America.It is a descendant publication of Baden-Powell's original handbook, Scouting for Boys, which has been the basis for Scout handbooks in many countries, with some variations to the text of the book depending on each country's codes and customs.
More than 99 percent of all species, amounting to over five billion species, [7] that ever lived on Earth are estimated to be extinct. [8] [9] Estimates on the number of Earth's current species range from 10 million to 14 million, [10] of which about 1.2 million have been documented and over 86 percent have not yet been described. [11]
Monday, April 22nd marks Earth Day 2024, and while we aren’t limiting our pledge to live a little greener to a single day, it’s a great opportunity to teach our kids about living sustainably.
3. Ride before you drive. Wherever you need to go on Earth Day, from point A to point B, make it a priority to leave a little earlier and trade your tires for some wheels.
Since Earth's Birthday Project's founding in 1989, it is estimated that more than 15 million school children have participated in butterfly and sunflower activities, as well as rainforest and river conservation. In the late 1980s, as the twentieth anniversary of Earth Day approached, Cliff Ross was teaching middle school in New York City.
Keep America Beautiful also co-sponsors the "Keep America Beautiful Hometown USA Award" with the Boy Scouts of America that boy scouts can earn by completing a non-paid, community service project, with the approved scout project being designed to "help keep America beautiful and benefit the community either physically or financially." [23] [24]