and among the recreations you mentioned, what risk does the third one face?
Injuries due to mountain biking are possible in the more extreme disciplines like downhill biking, free ride and dirt jumping. Injuries range from minor wounds to major injuries such as broken bones, head or spinal injuries
Mountain biking
Injuries are a given factor when mountain biking, especially in the more extreme disciplines like downhill biking, free ride and dirt jumping. Injuries range from minor wounds, such as cuts and abrasions from falls on gravel or other surfaces, to major injuries such as broken bones, head or spinal injuries resulting from impacts with rocks, trees or the terrain being ridden on. Another risk factor is that mountain biking takes places in wilderness area so emergency response will be delayed in case of injury. 
where is newberry volcano located? South of Bend, Oregon, United States which sub-features it comprises of? More than 400 vents which include cinder cones, lava domes, lava edifices what recreational value does it have? Fishing, camping, mountain biking, hiking did it erupt recently? No then when did it erupt last? 1,300 years ago. which natural energy is produced here? Geothermal energy. what kind of energy is this? Thermal energy generated and stored in the Earth what are its types? Vapor-dominated, liquid-dominated what kind of effect it has on the environment? Fluids drawn from the deep Earth carry  carbon dioxide, hydrogen sulfide, methane and ammonia which contribute to global warming, acid rain, and noxious smells if released. which human related activity cause this rain? Electricity generation using coal, animal agriculture, factories, and motor vehicles how is our soil effected due to this? Some microbes are unable to tolerate changes to low pH and are killed. The enzymes of these microbes are denatured  by the acid. which areas are mostly affected by it? Eastern Europe from Poland northward into Scandinavia,  the eastern third of the United States, and southeastern Canada in the very beginning you mentioned some sub-features, what is meant by the first one i that list? It is a steep conical hill of loose pyroclastic fragments, such as either volcanic clinkers, volcanic ash, or cinder that has been built around a volcanic vent. and how is it affected by the environmental conditions? The size and shape of cinder cones depend on environmental properties as different gravity and/or atmospheric pressure might change the dispersion of ejected scoria particles.
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Mountain biking [SEP] Risks
Injuries are a given factor when mountain biking, especially in the more extreme disciplines like downhill biking, free ride and dirt jumping. Injuries range from minor wounds, such as cuts and abrasions from falls on gravel or other surfaces, to major injuries such as broken bones, head or spinal injuries resulting from impacts with rocks, trees or the terrain being ridden on. Another risk factor is that mountain biking takes places in wilderness area so emergency response will be delayed in case of injury. Protective equipment can protect against minor injuries and reduce the extent or seriousness of major impacts, but may not protect a rider from major impacts or accidents.