1. Changes in the pattern of earthquakes produced by the movement of magma. 2. Magma entering a near-surface magma chamber, which leads to inflation of the volcano. 3. Changes in the amount or composition of gases released from a volcano.
Answer: Temperature, Pressure, and structural formation
Explanation:
Magma is a molten and semi-molten rock mixture found under the surface of the Earth. When magma breaks the surface, as a volcanic eruption, it is called lava. Volcanologist determine the movement of magma towards the earth surface by considering the temperature, pressure and structural formation of a place.
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