Asteroid that wiped out dinosaurs probably helped create our rainforests – The Washington Post

Video: Investigating the asteroid that killed the dinosaurs
The fiery crash is thought to have generated massive heat, triggered tidal waves and clouded over the sky. In the aftermath, as much as 75 percent of all land-based life went extinct.
To figure out what the area was like before the fiery extinction event, the researchers studied leaf and pollen fossils from the region. They tell a story of two different forests. Although the region was wet and warm before the crash, it teemed with conifers…

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