Mass extinctions are rapid global decreases in Earth's biodiversity, with five key events identified over the planet's history, arguably the most famous of which occurred ~66 million years ago during the Cretaceous, which ...
In understanding the global carbon cycle, "black carbon"—decay-resistant carbon molecules altered by exposure to fire or combustion—has long been presumed to originate on land and work its way to the ocean via rivers ...
Environment
Nov 7, 2019
4
527
It's a long-running Australian detective story. From the 1980s onwards, researchers found eggshell fragments, and on rare occasions whole eggs, exposed in eroding sand dunes within the country's arid zone (which covers most ...
Paleontology & Fossils
Jan 24, 2023
0
44
(PhysOrg.com) -- Geologists may have uncovered the answer to an age-old question - an ice-age-old question, that is. It appears that Earth's earliest ice ages may have been due to the rise of oxygen in Earth's atmosphere, ...
Earth Sciences
May 7, 2009
6
2
A study published in the journal Geology rules out that extreme volcanic episodes had any influence on the massive extinction of species in the late Cretaceous. The results confirm the hypothesis that it was a giant meteorite ...
Paleontology & Fossils
Sep 20, 2021
2
1214
Roughly 430 million years ago, during the Earth's Silurian Period, global oceans were experiencing changes that would seem eerily familiar today. Melting polar ice sheets meant sea levels were steadily rising, and ocean oxygen ...
Earth Sciences
Mar 28, 2019
1
2230
(Phys.org)—NASA's car-sized rover, Curiosity, has taken significant steps toward understanding how Mars may have lost much of its original atmosphere.
Space Exploration
Nov 2, 2012
17
0
The long, slow decay of carbon-14 allows archaeologists to accurately date the relics of history back to 60,000 years.
General Physics
May 26, 2011
31
0
Two decades of atomic bomb testing in the atmosphere are yielding an unexpected bonus for consumers, scientists reported here today at the 239th National Meeting of the American Chemical Society (ACS). It's a new test to ...
Analytical Chemistry
Mar 22, 2010
4
0
(Phys.org) —BYU researchers have dug up new evidence from an ancient Maya city that may help solve the mystery of just how many people lived in the civilization.
Archaeology
Jun 26, 2013
0
2
