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MAGMAJOHN FLORENTINO E. ECHON

Factors that affect the viscosity of MagmaTemperatureChemical composition/ silica contentAmount of dissolved gasses

1. TemperatureThe viscosity of magma decreases with temperature. The higher the temperature of magma is, the lower is its viscosity. As lava flows, it cools and begins to harden, its ability to flow decreases and eventually it stops.

2. Silica ContentMagmas with high silica content are more viscous than those with low silica content. The magma that contains less silica is relatively fluid and travels far before solidifying.

3. Amount of GasesOther factors being equal, gas (mainly water vapor) dissolved in magma tends to increase its ability to flow. Therefore, in near-surface environments, the loss of gases makes magma more viscous, forming a dome or a columnar

Viscosity of Magma in Different Conditions

Lava with less silica content has low viscosity that it can travel a great distance, forming a thin sheet.1

Lava with high silica content is tooviscous to travel far, and tends to break up as it flows.2

Lava with low amount of gas and high silica content is very viscous and does not flow out at all as it rises forming, a columnar plug in the vent.3

Lava with low amount of gas as it rises has high viscosity that it piles up at a vent resulting in a dome.4

1-2 Classification of volcanoes according to its eruption3-5 Classification of volcanoes according to its shape6-8 Factors that affect the viscosity of magma9. Mayon volcano is an example of _______________ cone volcano.10. It refers to molten rock

11. The higher the temperature the _________ viscosity.12. The higher the silica content the ____________ viscosity.13. The ______ amount of gases the higher the viscosity.14. The ________ temperature the higher the viscosity.15. The higher the amount of gas the _________ viscosity.

16-17 two characteristics

Lava with less silica content has low viscosity that it can travel a great distance, forming a thin sheet.1

Lava with high silica content is tooviscous to travel far, and tends to break up as it flows.218-19 two characteristics

Lava with low amount of gas and high silica content is very viscous and does not flow out at all as it rises forming, a columnar plug in the vent.320-22 three characteristics

Lava with low amount of gas as it rises has high viscosity that it piles up at a vent resultingin a dome.4 23 -24 two characteristics

25. Lava with less silica content has low viscosity that it can travel a great distance, forming a _____________sheet.

26. Lava with high silica content is _______ viscous to travel far, and tends to break up as it flows.18-19 two characteristics

27. Lava with low amount of gas and high silica content is ___________and does not flow out at all as it rises forming, a columnar plug in the vent.

28. Lava with low amount of gas as it rises has high _____________________ that it piles up at a vent resultingin a dome.

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