Word: fossilize
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Dates: during 1980-1989
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...justification for this new idea came from a series of startling geological studies in the late 1970s by two University of Chicago geologists. David Raup and John Sepkowski. By carefully analyzing fossil records of the evolution of marine animals, the two concluded that large-scale extinctions occur about every 26 million years...
...Berkeley team's principle researchers. They reasoned that iridium-rich asteroids bombarded the earth, kicking up so much terrestrial and asteroidal debris into the atmosphere that it blocked sunlight from the earth for as long as several months. As temperatures plummeted, plants and animals died, leaving the current fossil record...
Utilities favor a tax on fossil fuels, as car exhausts are partly implicated in acid rain. The proposal might be a good addition to a compromise, "spread the burden" plan...
Where the bird collection is numbered by specimen, though, the invertebrate paleontology collection is quantified in tonnage or groups of fossils. This fall the department had to throw away almost 20 tons of fossils because they were taking up too much room and no one could catalogue them. Only four fossil collections surpass Harvard...
Ruckelshaus professed surprise at the strong public reaction. After all, he pointed out, "we can't say any of these things for certain." Scientists noted that researchers have been cautioning for nearly a century that the burning of fossil fuels (coal, oil, natural gas) is steadily increasing the atmosphere's CO2 content. The invisible gas itself is not dangerous. In fact, it is vital to green plants, which combine CO2 with water in the presence of sunlight to produce carbohydrates...