Posts treating: "origin"
Wednesday, 15 June 2016
A new study is reviving a decades-old debate about how Earth’s rarest elements came to exist on our planet – theories that have implications for the origin of
A great temple to the god Amon was built at Karnak in Upper Egypt around c. 1785. It is from Amon that we get his cephalopod namesake, the ammonites and also the name origin for the compound ammonia or NH3.Ammonites were a group of hugely successful aquatic molluscs that looked like the still extant Nautilus, a coiled shellfish that lives off the southern coast of Asia.While the Nautilus lived on, ammonites graced our waters from around 400 million years ago until the end of the Cretaceous, 65 [...]
Dramatic change in the moon’s tilt may help us trace the origin of water on Earth Read
Dobzhansky (Jan.25, 1900–Dec. 18, 1975) is noted for being one of the architects of the modern Synthetic Theory of evolution. During the first 20 years of the 20th century, Darwin's theory of natural selection had fallen out of favor among scientists. Many thought it insufficient to explain the origin of adaptations, while new discoveries of gene mutations seemed to them to be incompatible
A primitive hadrosaurid from southeastern North America and the origin and early evolution of 'duck-billed' dinosaurs. Journal of Vertebrate Paleontology. 2016.
This new discovery shows that duck-billed dinosaurs originated in the eastern United States, what was then broadly referred to as Appalachia, before dispersing to other parts of the world.
Wallace (Jan. 8, 1823 – Nov. 7, 1913) was a British naturalist and biogeographer. He was the first westerner to describe some of the most interesting natural habitats in the tropics. He is best known for devising a theory of the origin of species through natural selection made independently of Darwin.
Between 1854 and 1862, Wallace assembled evidence of natural selection in the Malay
Dobzhansky (Jan.25, 1900–Dec. 18, 1975) is noted for being one of the architects of the modern Synthetic Theory of evolution. During the first 20 years of the 20th century, Darwin's theory of natural selection had fallen out of favor among scientists. Many thought it insufficient to explain the origin of adaptations, while new discoveries of gene mutations seemed to them to be incompatible
GeoLog-The official blog of the European Geosciences Union [2015-11-30 13:00:40]
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(135 visits) GB,US,CN,IE
Since its discovery back in the late 1600s the origin of the spectacular polygonal columns of the Giants Causeway, located on a headland along the northern coast of Ireland, has been heavily debated. Early theories for its origin ranged from being sculpted by men with picks and chisels, to the action of giants, through to the force of nature. It wasn’t until 1771 that Demarest, a Frenchman, suggested that the origin of the world-famous headland was indeed volcanic. “The myth goes that the [...]
Wallace (Jan. 8, 1823 – Nov. 7, 1913) was a British naturalist and biogeographer. He was the first westerner to describe some of the most interesting natural habitats in the tropics. He is best known for devising a theory of the origin of species through natural selection made independently of Darwin.
Between 1854 and 1862, Wallace assembled evidence of natural selection in the Malay
There are domes and there are "domes". Yosemite National Park has a lot of domes of one sort or another, and there has always been a bit of confusion about their origin. From various points in Yosemite Valley, one can spy at least four them, famous Half Dome, less famous Sentinel Dome, North Dome, and Basket Dome. Although Yosemite is famous as a work of glacial action, the domes actually
Otherwise known as, there ain't no such thing as a free lunch. At least, there isn't any longer in the Climate Division at NCAR.
It feels like a long time ago that we last dropped in to give seminars at NCAR. Well, perhaps that's not so surprising as it was during our previous careers :-) The origin of our current trip was actually jules being invited to NY for a workshop on monsoons
Large asteroids that crash into the moon cause fractures to the lunar crust that extend up to 25 kilometers (16 miles) below the moon’s surface, finds a new study. These cracks could contain a record of asteroid impacts that bombarded the inner planets billions of years ago, possibly shedding new light on the formation of our solar system and the origin of life on Earth, according to
Tell me this isn't one of the stranger looking skies you've ever seen. I would have been rather freaked seeing this without having known the origin. It's not clouds.
We were driving home after our latest journey, and could see a wildfire burning on the west side of the Great Valley north of Sacramento. We couldn't get details until we got home, but it turns out to be burning in the
Houston, We Have Geology!Occasionally, I post various items that are not exotic or from faraway places. I'll be leaving for Alaska soon to run a wilderness river (the Tatshenshini) and so look for a post from that trip soon. In the meantime, here are a few odds and endsI just loved the above-the-fold headline in this mornings Arizona Daily Sun! Geology plays a prominent role in the upcoming New Horizons mission to Pluto. As you can imagine, Flagstaff has more than a passing [...]
June 5, 2015 marked the deadline for lawmakers to pass bills out of their house to the opposite house. Bills that did not pass in their house of origin by that date have effectively died (unless such bill has been identified as a 2-year bill). Below is the status and summary of the oil and … Continue
The study Oldest Pathology in a Tetrapod Bone Illuminates the Origin of Terrestrial Vertebrates. 2015. Plos One
A 333-million year old broken bone is causing fossil scientists to reconsider the evolution of land-dwelling vertebrate animals.
Analysis of a fractured and partially healed radius (front-leg bone) from Ossinodus pueri, a large, primitive, four-legged (tetrapod),
Tis-sa-ack (Half Dome) from Glacier Point. For the origin of the name Tis-sa-ack, check my post at http://geotripper.blogspot.com/2014/11/if-these-cliffs-could-talk-tis-sa-ack.html
Tis-sa-ack is, along with Yosemite Falls and El Capitan, Yosemite Valley. The iconic rock stands high above the east end of the valley, rising to 8,839 feet (2,694 meters), just short of a vertical mile above
A molecular mechanism for the origin of a key evolutionary innovation, the bird beak and palate, revealed by an integrative approach to major transitions in vertebrate history. 2015. Bhullar, B-A. S., et al. Evolution
Scientists have successfully replicated the molecular processes that led from dinosaur snouts to the first bird beaks. PR
Abstract: The avian beak is a key
Green Tea and Velociraptors [2015-01-05 15:18:57]
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(165 visits) Cretaceous; GB,AU
Millions of years ago, crocodiles were far more diverse (and weird) than the ones we still have around today. They ranged from armoured, tank-like forms living on land and feeding on plants, to 9 metre long fully-fledged swimmers out in the open oceans. In the Jurassic period, most of the crocs we know of were of this second kind, the whole marine forms. These comprised a group known as thalattosuchians, and they had long snouts for snapping up fish, salt glands, and even flipper-like arms and [...]
Investigate the type and origin of the ingredients of soil with this Earthlearningidea, 'Make your own soil'. Using a little water, pupils mix together the organic and inorganic components of a typical soil. What is missing?
This activity can be used in any lesson about the environment, rocks and landscape, agriculture, gardening or investigations out of doors. More soil activities can