At the consumption edges of the plate, the material has thermally contracted to become dense, and it sinks under its own weight in the process of subduction at an ocean trench.

At this time, a spreading center between the Pacific Plate and the Farallon Plate ( which is now mostly subducted, with remnants including the Juan de Fuca Plate, Rivera Plate, Cocos Plate, and the Nazca Plate ) was beginning to interact with the subduction zone off the western coast of North America.

At present the steepest dipping subduction zone lies the Marianas Trench where also the earths oldest oceanic crust lies ( Jurassic age ), if exempting ophiolites.

At a subduction boundary the motion is due to one plate slipping beneath the other plate resulting in an interplate thrust or megathrust earthquake.

At the subduction zone, " slab-pull " comes into effect.

At three points along the line of the dike there were deeper underwater trenches where the tidal current was much stronger than elsewhere.

At the end of World War I, the standoff in the Western Front caused the Imperial German Army to gather experienced and particularly skilled soldiers to form " Assault Teams " which would break through the Allied trenches.

At 06: 30 the No. 5 Wing attacked the Ottoman defences, drawing some fire which revealed the locations of machine guns, trenches and five redoubts.

At 4. 30 a. m. a supporting attack was planned at the Nek against Baby 700, intended to coincide with the New Zealanders attacking from Chunuk Bair down onto the rear of the Ottoman trenches on Battleship Hill.

At intervals they dropped bombs on the system of redoubts and trenches.

At 0540 on 4 November, after repeated attempts at breaking through the Axis lines – Lt-Col Reeves-Moore lead the South African armoured cars into the rear of the Axis positions, ".... the eager children of any mechanized pursuit ... scampered at dawn into the open desert beyond the mines and trenches and guns, to make their exuberant mischief amid the disintegrating enemy ".

At their next meeting, six days later, they learned from captured slaves that the Turkish garrison, numbering around 3000, had drug trenches and strengthened their defenses.

At the beginning of the war, the French Army was wearing the uniform of the Franco-Prussian War of 1870, but the uniform was maladapted to the trenches, and so in 1915 the Army replaced the uniform, with the Adrian helmet replacing the képi.

At the great Battle of Belgrade ( 1717 ) he led the second line of left wing cavalry in a brilliant and decisive charge which drove the forces of the Ottoman Empire to their trenches.

At Gommecourt the German trenches curved around a chateau and its parkland, creating a salient that marked the most westerly point of German territory.

At the time, there was a summer house on the top of the mound, and so trenches were cut on three sides.

At the high point was a substantial earth works with trenches and parapets.

At 3. 20 a. m. the British artillery opened their intense bombardment on the German front-line trenches.

At 3. 25 a. m., when the bombardment lifted to the second-line reserve trenches, the infantry rushed in.

At one point, he is badly wounded and is left for dead, thrown naked onto a pile of corpses behind the trenches, only to come stumbling, frenzied and delirious, into the arms of Jack Firebrace.

At 8: 40 am, the battalion received orders to advance and clear the German first-line trenches.

At Poniatowa, on November 4, Morgen witnessed the entire drama, as the camp inmates-" 6, 000 Jews and 9, 500 Jewesses "-reported to the execution site, surrendered their personal effects and clothing, then went naked to self-prepared trenches in order to be shot one-by-one: " the men went first, into one trench, and later the nude women had their own separate trenches .... all passed silently and methodically through the trenches, so the executions went very quickly.

At the same time, Nana Sahib's forces were wary of entering the entrenchment, as they believed that it had gunpowder-filled trenches.

At the same time, Imperial forces attacked from the front and, after ferocious close-quarter fighting, broke through the trenches surrounding the Ottoman camp.

At 5: 50 am the 1st battalion left its positions and started to push towards the Mereya river and the German trenches located 200 metres further westwards.

At the front, the contingent took over three advanced posts, about 100 yards distant from the others, joined by communication trenches.

At Hartmannswillerkopf stands a national monument of World War I for the fighting which took place in the trenches here.

At the mouth of the Rogue River, along the coast of Curry County, is the Otter Point Formation, a mélange of metamorphosed sedimentary rocks such as shales, sandstones, and chert.

" At the congress De Geer formally introduced the term varve defining it as any annual sedimentary layer, and also proposed that the term geochronology be restricted to varve dating, other existing techniques being less accurate and precise.

At this point the river narrows and is constricted between 800, 000 year old volcanic, basaltic lava flow and a much older steep, silurian, sedimentary spur.

At Ercall Quarry itself, you can see the contact ( boundary ) between Precambrian rocks and the younger ( Cambrian ) sedimentary rocks.

At 1. 8 Ga, Banded iron formations ( BIF ) are common sedimentary rocks throughout the Archean and Paleoproterozoic ; their disappearance marks a distinct shift in the chemistry of ocean water.

At the end of this period two pious Christians in Rome receive the revelation which leads them to seek the next Pope on the rock.

At this point Mrs. Frances Cupply, one of Wright's handsome daughters by his first wife, came from the house and tried to calm Miriam as she tore down a no visitors sign and smashed the glass pane on another sign with a rock.

At the rock, a local mother, Mrs. Schroeder, tries to tell her child, Baby Joan, to come down from the rock, when Baby Joan licks it-and a spring of water begins flowing from it.

* Columbus, Ohio based pop / rock band Casey At The Bat, formed in 2012.

At 15 he founded a punk rock band, The Ripchords, whose sole release, an eponymous EP with four tracks, was championed by the BBC Radio One DJ John Peel.

At Dolaucothi they stoped out the veins, and drove adits through barren rock to drain the stopes.

At the Coventry club in the New York City borough of Queens, The Dictators used rock as a vehicle for wise-ass attitude and humor.

At the same time British audiences were beginning to encounter American rock and roll, initially through films including Blackboard Jungle ( 1955 ) and Rock Around the Clock ( 1955 ).

At Chess Records in the spring of 1955, Bo Diddley's debut record " Bo Diddley "/" I'm A Man " climbed to # 2 on the R & B charts and popularized Bo Diddley's own original rhythm and blues clave-based vamp that would become a mainstay in rock and roll.

Like Alan Wilson, Duane Allman played a key role in bringing slide guitar into rock music, through his work with The Allman Brothers Band, specifically on the 1971 live album At Fillmore East and with Derek and the Dominos ' Layla and Other Assorted Love Songs album.

At 15 he began to write lyrics (" I like to rock, I like to dance, I like pretty girls taking down their pants " MixMag 1996 ).

At Glen Tilt in the Cairngorm mountains he found granite penetrating metamorphic schists, in a way which indicated to him that the presumed primordial rock had been molten after the strata had formed.

* June 30 – At the Roskilde Festival near Copenhagen, Denmark, 9 die and 26 are injured on a set while the rock group Pearl Jam performs.

At any given pressure and for any given composition of rock, a rise in temperature past the solidus will cause melting.

At some time in the distant past Malta was submerged, as shown by marine fossils embedded in rock in the highest points of Malta.

At depth, some kimberlite breccias grade into root zones of dikes made of unfragmented rock.

At Kanyakumari, the Swami meditated on the " last bit of Indian rock ", famously known later as the Vivekananda Rock Memorial, for three days.

At the Red Dog Saloon, The Charlatans were the first psychedelic rock band to play live ( albeit unintentionally ) loaded on LSD.

At the time, the group's musical style was characterized by critics as " industrial rock ", and for their live performances they used gramophones, radio devices and electronic instruments constructed by themselves.

At the beginning of soil formation, the bare rock out crops is gradually colonized by pioneer species ( lichens and mosses ).

At a banquet, Count Adhemar tries to trip up the unsophisticated " Sir Ulrich " by urging him to show the other guests a dance from his own country ; William, who's only spent a couple of hours learning to dance that day before the banquet, improvises with Jocelyn and comes up with something suited to a rock video ( the featured song in this scene was " Golden Years " by David Bowie ).

Notable Australian musicians include: the opera singers Dame Nellie Melba and Dame Joan Sutherland ; country music stars Slim Dusty ( Australia's biggest selling domestic artist ) and John Williamson ; solo artists John Farnham and Olivia Newton-John, Pub rock band Cold Chisel, folk-rocker Paul Kelly ; Dance group The Avalanches ; jazz guitarist Tommy Emmanuel ; pioneer rocker Johnny O ' Keefe, global folk-rock band The Seekers, global rock and pop bands Men At Work, The EasyBeats, Air Supply, Crowded House, AC / DC, INXS, Little River Band, Nick Cave and the Bad Seeds, Midnight Oil, Dragon, Silverchair, Youth Group, You Am I and Powderfinger ; the " pop princess " Kylie Minogue, Pendulum, Pop Rock duo Savage Garden and alternative music stars the John Butler Trio, Xavier Rudd, Wolfmother, Tame Impala and The Vines.