Where does eruption collide?

In geology, an eruption is the discharge of magma, gas, and fragmented rock from a volcano at the Earth's surface, ranging from quiet lava effusion to violent explosive blasts. Newhall and Self's 1982 The volcanic explosivity index (VEI) introduced a scale that ranks eruptions by the volume and height of what they eject. The referent is a geophysical release of material from the planet's interior, measured by erupted volume and explosivity, and it shares only the meaning of bursting forth with a tooth breaking through the gum or a rash appearing on the skin.[1]

Unit

Volume, explosivity, and style of material discharged from a volcano

Recovery means

Not applicable

Measured by

Ranked by the Volcanic Explosivity Index and by erupted volume, column height, and duration

In dentistry, eruption is the process by which a developing tooth moves from its site of formation in the jaw through the bone and gum into its functional position in the mouth. Wise and King's 2008 review Mechanisms of tooth eruption and orthodontic tooth movement describes the cellular signalling and bone remodelling that drive this movement. The referent is the emergence and positioning of a tooth, a developmental process timed in months and years, distinct from a volcanic discharge or a skin rash except for the common image of coming through to the surface.[2]

Unit

Timing and progress of a tooth's emergence into the mouth

Recovery means

Not applicable

Measured by

Tracked by eruption sequence and timing charts and by clinical and radiographic examination