Task: Question Generation
Input (English): Passage: Kitchen Creek flows through the park's three glens, which the descriptions of the waterfalls are organized by: Ricketts Glen, Glen Leigh, and Ganoga Glen. The falls are listed in order going upstream along Kitchen Creek, starting with the southernmost and ending at the northernmost in each glen. This is also the order in which a hiker would encounter the falls while traveling north along the creek on the Falls Trail.The Falls Trail is a 7.1-mile (11.4 km) loop hike. Starting at PA 118, it is 1.8 miles (2.9 km) north along the creek through Ricketts Glen to Waters Meet, where the trail divides. Following the Glen Leigh branch, it is 1.2 miles (1.9 km) north through the glen to the Highland Trail, then 1.0 mile (1.6 km) west along the Highland Trail to Ganoga Glen. Turning southeast, it is 1.3 miles (2.1 km) through Ganoga Glen back to Waters Meet, then the 1.8 miles (2.9 km) through Ricketts Glen is retraced, but heading south back to PA 118.The description of each waterfall starts with the name. While the Pennsylvania Department of Conservation and Natural Resources (DCNR) Bureau of State Parks names 22 waterfalls in Ricketts Glen State Park (all but Kitchen Creek and Shingle Cabin), the United States Geological Survey (USGS) Geographic Names Information System (GNIS) names 23 (all but Shingle Cabin), and Scott E. Brown's 2004 book Pennsylvania waterfalls: a guide for hikers and photographers names 24. There are also several unnamed waterfalls in the park, with the total number of falls given as 33 or 34. For each waterfall the height is given next, followed by the elevation above sea level, and the latitude and longitude. Each waterfall in the table is classified according to the four types used in Brown's book (falls, cascade, slide, and chute), with some classified as combinations of types. For each waterfall there are notes, which can give more information on the waterfall, the etymology of the name, and the location on the Falls Trail, followed by a photograph.
Output (English): What are the four types of classifications used in Brown's book for waterfalls?