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water body under the influence of gravity and differences in density. Warmer pyroclastic currents are associated with greater sinking motion. If there is a sufficient flux in volume and mass into a water body, the shoreline can be displaced such that the water recedes and new land is formed. For example, during some phases of the Soufriere Hills volcano on Montserrat, pyroclastic flows were filmed about 1 km offshore. These show the water boiling as the flow passes over it. The flows eventually built a delta, which covered about 1 km2. Another

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