Volcanoes are classified into three types based on frequency: Active, Dormant and Extinct. A Composite volcano (or stratovolcano) is a classification based on structure and shape, not frequency. It refers to a volcano built up by many layers of hardened ...
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Volcanoes are often called the ‘safety valve of nature’ because they allow the immense heat and pressure accumulating within the Earth’s interior to escape. Without these vents, the internal pressure generated by molten magma and gases could potentially lead to ...
Discovered by Danish seismologist Inge Lehmann in 1936, this discontinuity is the boundary between the liquid outer core and the solid inner core. She proved the inner core’s existence by showing that P-waves were being reflected and refracted by a ...
Attenuation is the weakening of seismic waves as they move away from the source. This happens because the energy spreads over a larger area (geometric spreading) and is absorbed by the rocks (frictional heating). High-frequency waves attenuate faster than low-frequency ...
A tiltmeter is a sensitive instrument used to measure very small changes in the vertical level of the ground. It can detect the “bulging” or “tilting” of the Earth’s crust that often occurs when stress accumulates along a fault line ...