India vs England: Rohit Sharma powers India to the finish line in the 1st…

first_imgAdvertisement Advertisement(Image Courtesy: CricketCounty) Rohit Sharma smashed a magnificent 137* as India cruised home vs England in the first ODI here at Trent Bridge.India after winning the toss and put the hosts into bat first. England got off to a flying start by scoring 70 of the first 10 overs without losing any wicket. But what followed after that was absolute carnage from Kuldeep Yadav.The Chinaman bowler picked 3 successive wickets in consecutive overs to put a stop to the run flow. Buttler and Stokes tried to revive the inings by scoring 50s but they couldn’t carry on as Kuldeep returned to claim both their wickets.Finally Kuldeep ended with figures of 6-25 with England being restricted to 268 from once when they looked to get in excess of 300.Coming back from the break, the Indian openers got off to a quick and solid start. Dhawan scored a quickfire 40 before perishing to Moeen Ali. The wicket saw the Indian captain take center stage.Kohli combined with Rohit Sharma to add 167 runs for the 2nd wicket to take the game away from the opposition. Kohli scored a solid knock of 75 that comprised of 7 fours.Rohit on the other side carried on till the end scoring a magnificent 137*. His explosive knock came of just 117 balls which comprised of 15 fours and 4 sixes.Him along with KL Rahul saw India home in the end. This win sees India take a 1-0 lead in the 3 match ODI series. The 2nd match is set to take place at Lord’s on Saturday.Brief Scores:England 268 (49.5) (Ben Stokes 50, Jos Buttler 53, Kuldeep Yadav 6-25)India 269-2 (40.1) (Rohit Sharma 137*, Virat Kohli 75, Moeen Ali 1-60)Also Read:India vs England: Twitter hails Kuldeep Yadav for wrecking the English batting line up with 6 wicketslast_img read more

Climate cycles didnt shape oceans abyssal hills

first_img Email Earlier this year, two papers—one published in Science and the other in Geophysical Review Letters—added a new wrinkle to the debate. They suggested that long-term climate cycles could be modulating the amount of magma erupting on the sea floor. As glaciers grew and retreated, sea levels rose and fell. Those massive fluctuations in pressure would drive periodic pulses of magma to erupt. The Science paper further suggested the distribution of hills at one mid-ocean ridge could be matched with three well-known climate cycles—the Milankovitch cycles—that take place every 23,000, 41,000, and 100,000 years. These Milankovitch cycles are tied to Earth’s wobbly orbital axis, its oscillating axial tilt, and its orbital eccentricity. Jean-Arthur Olive Sign up for our daily newsletter Get more great content like this delivered right to you! Country Click to view the privacy policy. Required fields are indicated by an asterisk (*)center_img Can Earth’s ice ages be seen in the undulating fabric of the sea floor? Earlier this year, a pair of papers suggested that long-term cycles of glaciation and melting trigger pulses of lava that harden into sea floor hills. But now, a new study throws cold water on that hypothesis, finding that these climate-driven pulses did not significantly shape the sea floor. Instead, they say, the underwater hills likely come from faulting action and steady—rather than climate-driven—magma eruptions.“The main point is that the crustal bathymetry is complex,” says David Lund, a paleoceanographer at the University of Connecticut, Avery Point, who was not involved with the study. With so many processes shaping the sea floor, he says, climate-related signals are extremely difficult to detect.A map of Earth’s ocean floor reveals a jagged landscape of tall mid-ocean ridges flanked by a rippling series of smaller hills and grooves. These so-called abyssal hills, some a few hundred meters high, are the most abundant topographic feature on Earth, covering about a third of the ocean floor. Given their ubiquity, geologists have long tried to understand their origin. They have, of course, long known that mid-ocean ridges are the birthplace of new sea floor. As two tectonic plates pull apart, magma wells into the gap, cooling into new rock that is then dragged away from the ridge. Then, as the crust stretches and cools, it cracks, forming faults that allow up-and-down movement. Some scientists have argued that this process alone is sufficient to produce the rugged terrain at most ridges. But others say that periodic fluctuations in magma volume can also help make the abyssal hills. Country * Afghanistan Aland Islands Albania Algeria Andorra Angola Anguilla Antarctica Antigua and Barbuda Argentina Armenia Aruba Australia Austria Azerbaijan Bahamas Bahrain Bangladesh Barbados Belarus Belgium Belize Benin Bermuda Bhutan Bolivia, Plurinational State of Bonaire, Sint Eustatius and Saba Bosnia and Herzegovina Botswana Bouvet Island Brazil British Indian Ocean Territory Brunei Darussalam Bulgaria Burkina Faso Burundi Cambodia Cameroon Canada Cape Verde Cayman Islands Central African Republic Chad Chile China Christmas Island Cocos (Keeling) Islands Colombia Comoros Congo Congo, the Democratic Republic of the Cook Islands Costa Rica Cote d’Ivoire Croatia Cuba Curaçao Cyprus Czech Republic Denmark Djibouti Dominica Dominican Republic Ecuador Egypt El Salvador Equatorial Guinea Eritrea Estonia Ethiopia Falkland Islands (Malvinas) Faroe Islands Fiji Finland France French Guiana French Polynesia French Southern Territories Gabon Gambia Georgia Germany Ghana Gibraltar Greece Greenland Grenada Guadeloupe Guatemala Guernsey Guinea Guinea-Bissau Guyana Haiti Heard Island and McDonald Islands Holy See (Vatican City State) Honduras Hungary Iceland India Indonesia Iran, Islamic Republic of Iraq Ireland Isle of Man Israel Italy Jamaica Japan Jersey Jordan Kazakhstan Kenya Kiribati Korea, Democratic People’s Republic of Korea, Republic of Kuwait Kyrgyzstan Lao People’s Democratic Republic Latvia Lebanon Lesotho Liberia Libyan Arab Jamahiriya Liechtenstein Lithuania Luxembourg Macao Macedonia, the former Yugoslav Republic of Madagascar Malawi Malaysia Maldives Mali Malta Martinique Mauritania Mauritius Mayotte Mexico Moldova, Republic of Monaco Mongolia Montenegro Montserrat Morocco Mozambique Myanmar Namibia Nauru Nepal Netherlands New Caledonia New Zealand Nicaragua Niger Nigeria Niue Norfolk Island Norway Oman Pakistan Palestine Panama Papua New Guinea Paraguay Peru Philippines Pitcairn Poland Portugal Qatar Reunion Romania Russian Federation Rwanda Saint Barthélemy Saint Helena, Ascension and Tristan da Cunha Saint Kitts and Nevis Saint Lucia Saint Martin (French part) Saint Pierre and Miquelon Saint Vincent and the Grenadines Samoa San Marino Sao Tome and Principe Saudi Arabia Senegal Serbia Seychelles Sierra Leone Singapore Sint Maarten (Dutch part) Slovakia Slovenia Solomon Islands Somalia South Africa South Georgia and the South Sandwich Islands South Sudan Spain Sri Lanka Sudan Suriname Svalbard and Jan Mayen Swaziland Sweden Switzerland Syrian Arab Republic Taiwan Tajikistan Tanzania, United Republic of Thailand Timor-Leste Togo Tokelau Tonga Trinidad and Tobago Tunisia Turkey Turkmenistan Turks and Caicos Islands Tuvalu Uganda Ukraine United Arab Emirates United Kingdom United States Uruguay Uzbekistan Vanuatu Venezuela, Bolivarian Republic of Vietnam Virgin Islands, British Wallis and Futuna Western Sahara Yemen Zambia Zimbabwe But Jean-Arthur Olive, a geodynamicist at Columbia University and lead author of the new paper, doubted that seafloor topography would be sensitive enough to record such relatively rapid changes in magma supply. Even long-term climate cycles are short relative to geologic time, where “we’re talking about hundreds of thousands to millions of years for plate tectonics,” Olive says.To find out whether the climate-driven hypothesis was possible, Olive and his colleagues modeled three different ways in which such rapid pulses of magma might change the face of the sea floor. First, they examined the strength of the tectonic plate itself. The bulk of the plate is made of oceanic crust, a relatively light layer of rock that floats on the denser mantle like a boat floating on water. Newly formed sea floor becomes part of that crust.But most new crust is not erupted and added to the sea floor, but is but is tacked on to the base of the crust. So the researchers wanted to determine whether pulses of magma would produce a crust thick and heavy enough to warp its surface. The models suggested it wouldn’t: The magma inputs didn’t significantly alter the surface of the sea floor. “The plates at the ridge axis simply have too much strength to deform enough to create topography that way,” Olive says.  A second test looked at how much sea floor a mass of magma could make. The team found that magma pulses that accumulated over 100,000 years—the longest of the three Milankovitch cycles—could produce tens of meters of crust. But the abyssal hills at some ridges can reach 200 meters high, so high that a few extra tens of meters wouldn’t make much of a difference.Finally, Olive and his team looked at how climate-driven magma pulses might interact with active faults to shape the sea floor. Different mid-ocean ridges spread at different rates; if magma pulses helped shape the abyssal hills on the ridges’ flanks, then the fastest-spreading ridges would have hills spaced farther apart, while slower-spreading ridges would have hills clustered closer together. But the reverse has long been known to be true.  So Olive and his team devised a new explanation: At fast-spreading ridges with abundant magma eruptions, the cooling, stretching crust forms new faults in rapid succession as it continues to spread. Under normal conditions, “You end up with a lot of closely spaced faults, and [few hills],” says Olive.Richard Katz, a geodynamicist at the University of Oxford in the United Kingdom who was an author on the previous Science paper, says he welcomes the new ideas. “The paper we published—we always knew it would be controversial.” But Katz contends the new study’s models are too simplistic. “Those models weren’t developed to consider processes at shorter times and spatial scales. While I think it’s reasonable to do what they’ve done, it’s also reasonable to say that these models aren’t detailed enough to capture these observations,” Katz says. The best way to resolve this, he says, is to gather and analyze more data from additional ridges.Gathering data from additional ridges is one strategy, Lund agrees. Another, he says, is to find a different proxy for climate-driven pulses of magma altogether—one that is independent of tectonics. To that end, he says, he and others have been examining hydrothermal vents at a mid-ocean ridge known as the East Pacific Rise. Such vents can serve as records of heat activity—which may include pulses of magma—at the ridge through time. Olive acknowledges that they’ve used a simplified model, but he doesn’t think a more detailed one will produce different results.  Rather than focusing on the surface expression of the abyssal hills, he and his colleagues suggest that researchers hunting for signals from climate cycles use seismic imaging at the base of the oceanic crust, where much of the new sea floor accretes and rapid pulses of magma might be more observable. “We’re not contradicting the idea that the modulations exist,” he emphasizes. “We’re contradicting the idea that it leads to the sea floor landscapes.”last_img read more