Premise: Coniston Water in Cumbria is the third largest lake in the English Lake District. It is five miles long by half a mile wide (8 km by 800 m), has a maximum depth of 184 feet (56 m), and covers an area of 1.89 sqmi . The lake has an elevation of 143 feet (44 m) above sea level. It drains to the sea via the River Crake.
Hypothesis: Coniston Lake is not a volcano.