They called themselves Earth First or more jokingly The Strawberry Liberation Front or even Mindless Thugs Against Genetic Engineering.
The conventional explanation for this arrangement is that the glass fell to Earth first, then giant waves caused by the impact covered them with sediment, then iridium-containing dust settled out of the atmosphere over the course of a few weeks and formed the clay.
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For instance, Chinese producers of rare-earth minerals first drove down prices to uneconomic levels, and this led to the closing of mines elsewhere.
Look no further than Laika, the first animal to orbit Earth, soon becoming the first animal to die in orbit, not too long after achieving that earlier distinction.
On April 22, 1970, millions of Americans came together to celebrate the first Earth Day.
On that first Earth Day, Nelson, 53, spoke to a larger than expected crowd in Denver, Colorado.
And 40 years ago, when Gaylord conceived and celebrated the first Earth Day, the world looked pretty different.
America rose to meet the call to action in the months and years that followed the first Earth Day.
About 20 million Americans participated in the first Earth Day, organizers said, though that number is most likely inflated.
The picture became inextricably linked to the environmental movement when it was adopted for the first Earth Day in 1970.
Smith says the plant extinctions that have occurred since the first Earth Summit in 1992 have all been entirely avoidable.
Earth Day was first celebrated in 1970 and coincided with the founding of the Environmental Protection Agency by the Nixon Administration.
Two years later, at the first Earth Day, its founder predicted that the greatest challenge to the environment would be population growth.
By the time Earth took its first breath three billion years ago, geologists now believe, Mars had been suffocating for a billion years.
Wall says the event, as well as the Soviets launching the first Earth-orbiting satellite four years before, could have been just what the U.S needed.
Los Angeles, California (CNN) -- There were several speeches at the first Earth Day -- back in 1970, before the disco era -- on the National Mall.
These threats, so much more severe than in 1992 when Rio hosted its first Earth Summit, require that we act now to make sustainability disclosure a global norm.
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Just a day after announcing the discovery of the first Earth-size planets ever detected outside our Solar System, scientists have confirmed the existence of two even smaller worlds.
We can now add soil composition to the list, as Curiosity became Earth's first visitor to the Red Planet to both gather and analyze Martian soil on its own.
Within that green box is a microplate reader, a workhorse appliance in labs on Earth but the first of its kind to work in the near-zero gravity at 250 miles up.
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Over the 40 years since the first Earth Day, there have been many laws, and through the vision of a few companies and leaders, progress has been made in the profitability of sustainability.
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Even if I wasn't as cool and thoughtful as I hoped to appear, the first Earth Day's message was good then, and it's better today: We have to take care of the Earth.
In 1969, the year before the first Earth Day, two environmental disasters grabbed the country's attention: a massive oil spill coated the coast of Santa Barbara, California, and the Cuyahoga River in Cleveland, Ohio, grew so polluted that it actually caught fire.
In 1962, the Mariner II space probe began sending back to Earth man's first information from another planet, Venus.
This is the first time since June 2004 that the Japanese supercomputer "Earth Simulator" has been ranked first on the TOP500 list.
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It joins the US Marines famed V-22 Osprey as the second such aircraft on earth and is the first unmanned aircraft packing the technology.
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But the fact that rocky planets can take shape around metal-poor stars means the first roughly Earth-like worlds may have formed long, long ago.
The first Rio Earth Summit in 1992 called for nations to find ways to conserve fish stocks and prevent international conflicts over fishing on the high seas.
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