Piping pseudokarst. The 2010 Guatemala City sinkhole formed suddenly in May of that year; torrential rains from Tropical Storm Agatha and a bad drainage system were blamed for its creation. It swallowed a three-story building and a house; it measured approximately 20 m (66 ft) wide and 30 m (98 ft) deep.
âFour legs good, two legs bad.â This phrase, which occurs in Chapter III, constitutes Snowballâs condensation of the Seven Commandments of Animalism, which themselves serve as abridgments of Old Majorâs stirring speech on the need for animal unity in the face of human oppression.
Chronic venous insufficiency (CVI) results when the veins in the legs no longer pump blood back to the heart effectively. Normally, when the leg muscles contract, they squeeze the deep veins of the legs, aiding in circulation. Veins contain one-way valves that keep the blood from flowing in the opposite direction, toward the foot. These valves can wear out over time, leading to blood leaking backward and pooling in the veins of the leg.