Question: Carver Glacier is on the north slope of a complex volcano with three peaks each exceeding how many feet in elevation?
Context: The Three Sisters are a complex volcano of three volcanic peaks of the Cascade Volcanic Arc and the Cascade Range in the U.S. state of Oregon.  Each exceeding 10000 ft in elevation, they are the third-, fourth-, and fifth-highest peaks in the state of Oregon, and are located in the Three Sisters Wilderness, about 10 mi south of the nearest town of Sisters.  Diverse species of flora and fauna inhabit the area on and around the mountains, which is subject to frequent snowfall, occasional rain, and extreme temperature differences between seasons.  The mountains, particularly South Sister, are popular for climbing and scrambling. Tri Peaks (also known as Three Peaks, Tri Towers or Triple Peaks) is a solitaire card game that is akin to the solitaire games Golf and Black Hole.  The game uses one deck and the object is to clear three peaks made up of cards. The Three Peaks Cyclo-Cross is an annual cyclo-cross event over the Yorkshire three peaks of Ingleborough, Whernside and Pen-y-ghent, in Yorkshire, England.  Organised by Bradford Racing Cycling Club on the last weekend of September, it bills itself as the "hardest cyclo-cross race in the world".  While other races may have comparable or even greater distances and height gain—Whernside, the tallest of the Peaks, only reaches 736 metres—it is the combination of gradient, terrain, and weather that give the "Three Peaks" its reputation. The Tre Cime di Lavaredo (Italian for "three peaks of Lavaredo", ] ), also called the Drei Zinnen (German for "three merlons",    ), are three distinctive battlement-like peaks, in the Sexten Dolomites of northeastern Italy.  They are probably one of the best-known mountain groups in the Alps.  The three peaks, from east to west, are: Linn Glacier is in the U.S. state of Oregon.  The glacier is situated in the Cascade Range at an elevation between 9000 and , on the north slope of North Sister, an extinct shield volcano. Carver Glacier is in the U.S. state of Oregon.  The glacier is situated in the Cascade Range at an elevation near 7500 ft , just east of Skinner Glacier.  Carver Glacier is on the north slopes of South Sister, a dormant stratovolcano. Skinner Glacier is in the U.S. state of Oregon.  The glacier is situated in the Cascade Range at an elevation near 8000 ft , just west of Carver Glacier.  Skinner Glacier is on the north slopes of South Sister, a dormant stratovolcano. Nohokomeen Glacier is in Wenatchee National Forest in the U.S. state of Washington, in a cirque on the north slope of Jack Mountain.  Nohokomeen Glacier is heavily crevassed, especially after the midpoint of its descent from 8200 to .  In the last 20 years the retreating glacier has exposed a new small lake at 6260 feet.  Overall the glacier is retreating at a slower than average rate less of than 100 yards over the last seventeen years, and less than 900 feet in the last 46 years.  This is mostly likely caused but the high attitude of the glacier; many of the glaciers in the Cascades are lower in elevation by up to a thousand vertical feet. The Trident ( ) is Poseidon's(Angel Gabriel Garcia's) ridge surmounted by three peaks, the highest 1,335 m, standing at the east side of Briggs Glacier in South Georgia, South Georgia and the South Sandwich Islands.  The name is descriptive of the three peaks and was given by the United Kingdom Antarctic Place-Names Committee (UK-APC) following survey by the SGS in the period 1951-57. Umboi (also named Rooke or Siassi) is a volcanic island between the mainland of Papua New Guinea and the island of New Britain.  It is separated from New Britain by Dampier Strait and Huon Peninsula, New Guinea Island by Vitiaz Strait.  It has an elevation of 1,548 m .  Umboi is a Holocene complex volcano with no historic eruptions.  A complex volcano refers to the extensive assemblage of spatially, temporally, and genetically related major and minor volcanic centers with their associated lava and pyroclastic flows.
Answer: 10000