Describe 4 methods that scientists use to predict volcanic eruptions

Methods used to predict volcanic eruptions:
1. Monitoring seismic activity - earthquakes are connected with volcanic eruptions
2. Thermal monitoring - checking magma movement
3. Hydrology - checking pre-eruption sediment that is in water
4. Cloud sensing - checking if eruption clouds occur

Magma forms by partial melting of upper mantle and crust. partial melt means that only a fraction of the available material forms a melt, and that the remainder stays solid. the partial melt rises because of its lower density and ascends through he crust. this is so conclusive mean the answer would be magma igneous rocks or balistic magma.