Given the task definition and input, reply with output. In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.

Question: What is the current largest existent glacier in the world? Passage 1:Sacred Ground, the band's second album, came out in 1992. This album was McBride & the Ride's most successful, with all three of its singles reaching Top 5 on the country charts: "Sacred Ground" at number 2, followed by "Going Out of My Mind" (which McBride co-wrote with Kostas) and "Just One Night," both at number 5. "Sacred Ground" was co-written by Kix Brooks, who had previously released the song in 1989 from his self-titled debut album for Capitol Records before joining Ronnie Dunn to form Brooks & Dunn in 1991. In 1992, McBride & the Ride received a Best New Vocal Group or Duo nomination from the Country Music Association and Vocal Group of the Year nomination from the Academy of Country Music. More than four years after its release, Sacred Ground was certified gold by the Recording Industry Association of America for shipping 500,000 copies. Despite these sales, McBride remarked that the band still nearly lost its recording contract, due to other artists on the label selling even more strongly.
 Passage 2:The old moraine landscape of Lower Saxony emerged in the course of four great glacial advances of the Scandinavian ice sheet 350,000 to 130,000 years ago – one during the Elster glaciation and three during the Saale glaciation. The glacier of the most recent, Weichselian glaciation only reached the northeastern edge of the present Elbe valley depression, so that the existing terminal moraines beyond that point there were only affected periglacially, for example in the shape of solifluction over the frozen ground, by meltwater erosion and sediments or through wind-blown deposits of sand. The last two Saale glaciation advances in particular, the Drenthe II and the Warthe stadia, unfolded the East Hanonerian Terminal Moraine. It is therefore geomorphologically younger than the geest in western and central Lower Saxony, but clearly older than the young moraine landscapes in Mecklenburg-Vorpommern and Ostholstein (= Baltic Uplands).
 Passage 3:In addition to her club tour and many radio interviews, Simpson has made in-store appearances at Wal-Mart to meet with fans, and she has a number of television appearances planned for the weeks prior to and surrounding the album's release on April 22: on Nickelodeon's Kids Choice Awards on March 29, Total Request Live on April 17 (where she gave an interview and performed "Little Miss Obsessive"), the Today show on April 18 (where she gave an interview and performed "Little Miss Obsessive", along with her 2004 song from her debut album Autobiography, "Pieces of Me"), Dance on Sunset on April 20 (performing "Little Miss Obsessive"), The Tonight Show with Jay Leno on April 21 (where she performed "Little Miss Obsessive"), Dancing with the Stars on April 22 (where she performed "Boys"), The Ellen DeGeneres Show on April 24 (where she gave an interview and performed "Little Miss Obsessive"), and Jimmy Kimmel Live! on April 24 (where she performed "Little Miss Obsessive"). She subsequently went to Europe for more promotion, performing "Outta My Head" on television shows in the United Kingdom and Germany. In connection with the album release, clothing retailer Wet Seal launched a collection of tops designed by Simpson on April 22. According to Simpson, her inspirations for Bittersweet World were reflected in the clothing line. Wet Seal also planned to sell Bittersweet World in its stores and on its website, and planned to hold a contest for which the grand prize was to include a trip to meet Simpson and attend one of the concerts on her planned tour. Simpson's 12 date summer tour was subsequently cancelled. OK! Magazine reported on May 31 that Simpson cancelled her summer tour due to her pregnancy. On July 4, Simpson was scheduled to perform for The TODAY Show's Summer Concert Series, but that performance was also cancelled.
2