Ice ages: Evidence for past melting at the base of the GISP2 ice core from uranium-thorium disequilibria datinguraniumthoriumuranium-seriesgeochronologyGISP2 ice coreGreenlandIn order to further develop U-238-U-234-Th-230 disequilibria techniques for dating polar ice, we measured these nuclides by ...
The author cites Hallam (in the highlighted text) on the ice ages primarily in order to 选项: A、provide an example of a geologic phenomenon whose precise causes are not fully understood by geologists today B、criticize the geological community for an apparent lack of consistency in its response...
I was the second customer of the day after Korean Garden opened its doors for the day, and a Korean woman behind the counter was taking to-go orders by phone and hurriedly packaging styrofoam containers. The grill sizzled in the kitchen as I placed my order, and she ushered me to my a...
The most important are shorelines that contain coral reefs, because it is possible to obtain radiometric ages on fossils in the reef complex. Two of the most important and best-dated records are on the island of Barbados in the Caribbean and along the Huron Peninsula of New Guinea. The ...
EPIC EXPLORATION & ADVENTURE • Explore the unknown with Sid, Manny & Diego as playable characters. • Have casual fun in diverse environments like snowy islands and treacherous lush lands. • Overcome extreme hurdles and encounters with a hungry dinosaur and other foes in order to find miss...
On the Dynamics of The Ice Ages: Stage Paradox, Mid〣runhes Climate Shift, and 100㎏y Cycle 来自 ResearchGate 喜欢 0 阅读量: 20 作者:WH Berger,G Wefer 摘要: The Stage-11 Paradox consists in the fact that the stage sequence 12-11-10 has the greatest range of climatic variation in the...
Record in d is synchronized to AICC2012 chronology. Full size image We measured 234U-230Th ages on eleven opal layers from PRR50489 that constrain the timeframe of precipitation from 230 to 147 ka (Fig. 2b), and ten opal and calcite layers from MA113 ranging in age from 55 to 42...
the invention is a bicycle on ice or in a vehicle similar to a bicycle on ice, bicycle, adapted for travel over ice.it is on the bike on ice, in order, from front to back in a plane parallel to the ground.the following elements mounted on a framework, a front wheel, a pedal and...
From roughly the 16th to 19th centuries, much of the Earth was gripped by a persistent frigid cold. It left ripples through history—and some lessons for today’s climate crisis.
Origin of Ice Ages: An Ice Shelf Theory for Pleistocene Glaciation A RECENT paper by Wilsonsuggests that `thermal' surges of the Antarctic ice sheet led to the growth of large ice shelves in the Southern Ocean, and that these shelves cooled the Earth sufficiently to cause glaciations in the...