Information: - Ice is water frozen into a solid state. Depending on the presence of impurities such as particles of soil or bubbles of air, it can appear transparent or a more or less opaque bluish-white color. - The British National Antarctic Expedition, 190104, generally known as the "Discovery" Expedition, was the first official British exploration of the Antarctic regions since James Clark Ross's voyage sixty years earlier. Organized on a large scale under a joint committee of the Royal Society and the Royal Geographical Society (RGS), the new expedition aimed to carry out scientific research and geographical exploration in what was then largely an untouched continent. It launched the Antarctic careers of many who would become leading figures in the Heroic Age of Antarctic Exploration, including Robert Falcon Scott who led the expedition, Ernest Shackleton, Edward Wilson, Frank Wild, Tom Crean and William Lashly. - Mount Erebus is the second-highest volcano in Antarctica (after Mount Sidley) and the southernmost active volcano on Earth. It is the sixth highest ultra mountain on an island. With a summit elevation of , it is located on Ross Island, which is also home to three inactive volcanoes, Mount Terror, Mount Bird, and Mount Terra Nova. - Farthest South was the most southerly latitudes reached by explorers before the conquest of the South Pole in 1911. Significant steps on the road to the pole were the discovery of lands south of Cape Horn in 1619, Captain James Cook's crossing of the Antarctic Circle in 1773, and the earliest confirmed sightings of the Antarctic mainland in 1820. From the late 19th century onward, the quest for Farthest South latitudes became in effect a race to reach the pole, which culminated in Roald Amundsen's success in December 1911. - Antarctica (US English , UK English or ) is Earth's southernmost continent. It contains the geographic South Pole and is situated in the Antarctic region of the Southern Hemisphere, almost entirely south of the Antarctic Circle, and is surrounded by the Southern Ocean. At , it is the fifth-largest continent. For comparison, Antarctica is nearly twice the size of Australia. About 98% of Antarctica is covered by ice that averages in thickness, which extends to all but the northernmost reaches of the Antarctic Peninsula. - The British Antarctic Expedition 190709, otherwise known as the Nimrod Expedition, was the first of three expeditions to the Antarctic led by Ernest Shackleton. Its main target, among a range of geographical and scientific objectives, was to be first to the South Pole. This was not attained, but the expedition's southern march reached a Farthest South latitude of 8823'S, just from the pole. This was by far the longest southern polar journey to that date and a record convergence on either Pole. A separate group led by Welsh Australian geology professor Edgeworth David reached the estimated location of the South Magnetic Pole, and the expedition also achieved the first ascent of Mount Erebus, Antarctica's second highest volcano. - Edward Adrian Wilson FZS ("Uncle Bill") (23 July 1872 29 March 1912) was an English physician, polar explorer, natural historian, painter and ornithologist. - Sir Ernest Henry Shackleton (15 February 1874 5January 1922) was a polar explorer who led three British expeditions to the Antarctic, and one of the principal figures of the period known as the Heroic Age of Antarctic Exploration. Born in Kilkea, Athy, County Kildare, Ireland, Shackleton and his Anglo-Irish family moved to Sydenham in suburban south London when he was ten. His first experience of the polar regions was as third officer on Captain Robert Falcon Scott's Discovery Expedition 19011904, from which he was sent home early on health grounds, after he and his companions Scott and Edward Adrian Wilson set a new southern record by marching to latitude 82S. - Sir Tannatt William Edgeworth David (28 January 1858 28 August 1934), professionally known as Edgeworth David, was a Welsh Australian geologist and Antarctic explorer. A household name in his lifetime, David's most significant achievements were discovering the major Hunter Valley coalfield in New South Wales and leading the first expedition to reach the South Magnetic Pole. He also served with distinction in World War I. - The Heroic Age of Antarctic Exploration was an era beginning at the end of the 19th century and closing with Shackleton's Imperial Trans-Antarctic Expedition, the survivors stepping ashore in Wellington, New Zealand February 9, 1917. Historian Aant Elzinga gives the much later date of 1945, considering World War II to be the turning point in Antarctic research. During this period the Antarctic continent became the focus of an international effort that resulted in intensive scientific and geographical exploration and in which 17 major Antarctic expeditions were launched from ten countries. The common factor in these expeditions was the limited nature of the resources available to them before advances in transport and communication technologies revolutionized the work of exploration. This meant that each expedition became a feat of endurance that tested, and sometimes exceeded its personnel's physical and mental limits. The "heroic" label, bestowed later, recognized the adversities which had to be overcome by these pioneers, some of whom did not survive the experience; during this period 19 expedition members died. - Captain Robert Falcon Scott, (6 June 1868 29 March 1912) was a British Royal Navy officer and explorer who led two expeditions to the Antarctic regions: the Discovery Expedition, 19011904, and the ill-fated Terra Nova Expedition, 19101913. On the first expedition, he set a new southern record by marching to latitude 82S and discovered the Polar Plateau, on which the South Pole is located. During the second venture, Scott led a party of five which reached the South Pole on 17 January 1912, four weeks after Roald Amundsen's Norwegian expedition. On their return journey, Scott's party discovered plant fossils, proving Antarctica was once forested and joined to other continents. A planned meeting with supporting dog teams from the base camp failed, despite Scott's written instructions, and at a distance of 150 miles from their base camp and 11 miles from the next depot, Scott and his companions perished. - George Buckley ( 1866 -- 1937 ) explored Antarctica with the Nimrod Expedition led by Ernest Shackleton . After reading the paragraphs above, we are interested in knowing the entity with which 'george buckley ' exhibits the relationship of 'occupation'. Find the answer from the choices below. Choices: - bubbles - captain - explorer - geologist - historian - major - mountain - officer - official - ornithologist - painter - physician - professor - research
A:
explorer