Humans can make a difference but carbon is everywhere. This generation has the largest carbon footprint yet.
Decaying matter is called compost
The main zone for these phenomena in at least the western world is the Circum-Pacific Ring of Fire Belt. This is exemplified by the Western Cordillera in BC (Rockies and Coast Mts) in BC with a few inactive volcanoes, the volcanoes on the western margin of the US such as in Northern Californa and the Sierra Nevada, and the volcanoes in western and central Mexico and then the Andes with its' frequent western volcanoes and then in Japan and Indonesia with their volcanoes as well. Earthquakes are common in this Belt and occur due to plate movements including subduction below the BC coast and under the Andes.
The central sleep apnea is a condition, in which the person rapidly stops and starts breathing during the sleep.
The condition of the central sleep apnea is due to the change in the signaling pattern during the time of sleep. During this process, the respiratory centers present in the brain do not respond well and sometimes do not send signals to the muscle responsible for respiration.
Hence, the given blank can be filled with central sleep apnea.