Input: Read this: Glacial abrasion is commonly characterized by glacial striations. Glaciers produce these when they contain large boulders that carve long scratches in the bedrock. By mapping the direction of the striations, researchers can determine the direction of the glacier's movement. Similar to striations are chatter marks, lines of crescent-shape depressions in the rock underlying a glacier. They are formed by abrasion when boulders in the glacier are repeatedly caught and released as they are dragged along the bedrock.
Question: What charactrerizes glacial striations?

Output: unanswerable

Input: Read this: Pitt now prepared to send troops into Germany; and both Marlborough and Sackville, disgusted by what they perceived as the futility of the "descents", obtained commissions in that army. The elderly General Bligh was appointed to command a new "descent", escorted by Howe. The campaign began propitiously with the Raid on Cherbourg. Covered by naval bombardment, the army drove off the French force detailed to oppose their landing, captured Cherbourg, and destroyed its fortifications, docks, and shipping.
Question: Where did the troops land?

Output: Cherbourg

Input: Read this: Emigrants from Siberia that walked across the Bering land bridge into North America may have had dogs in their company, and one writer suggests that the use of sled dogs may have been critical to the success of the waves that entered North America roughly 12,000 years ago, although the earliest archaeological evidence of dog-like canids in North America dates from about 9,400 years ago.:104 Dogs were an important part of life for the Athabascan population in North America, and were their only domesticated animal. Dogs also carried much of the load in the migration of the Apache and Navajo tribes 1,400 years ago. Use of dogs as pack animals in these cultures often persisted after the introduction of the horse to North America.
Question: Evidence places dogs in North America when?

Output: 12,000 years ago

Input: Read this: The earliest recorded account of a circadian process dates from the 4th century B.C.E., when Androsthenes, a ship captain serving under Alexander the Great, described diurnal leaf movements of the tamarind tree. The observation of a circadian or diurnal process in humans is mentioned in Chinese medical texts dated to around the 13th century, including the Noon and Midnight Manual and the Mnemonic Rhyme to Aid in the Selection of Acu-points According to the Diurnal Cycle, the Day of the Month and the Season of the Year.
Question: What philosophers first described the diurnal process in humans?

Output:
unanswerable