Science Q3 VOLCANOES

Question 1

What does PHIVOLCS stand for?

Answer 1

Philippine Institute of Volcanology and Seismology

Question 2

steam-driven eruption as the hot rocks come in contact with water.

Answer 2

Phreatic or Hydrothermal Eruption

Question 3

Violent eruption due to contact between water and magma. Base surges are observed.

Answer 3

Phreatomagmatic Eruption

Question 4

a period weak to violent eruption characterized by fountain lava.

Answer 4

Strombolian Eruption

Question 5

characterized by tall eruption columns that reach up to 20 km high with pyroclastic flow and ashfall tephra

Answer 5

Vulcanian Eruption

Question 6

excessively explosive type of eruption of gas and pyroclastics

Answer 6

Plinian Eruption

Question 7

rich in iron, magnesium and calcium but low in potassium and sodium, low viscosity and low gas content.

Answer 7

Basaltic Magma (Basalt rock)

Question 8

Rich in potassium and sodium but low in iron, magnesium and calcium, high viscosity and gas content. formed by wet partial melting of the continental crust

Answer 8

Rhyolitic magma (rhyolite rock)

Question 9

moderate amount of present mineral, has intermediate viscosity formed by wet partial melting of magma under the ocean.

Answer 9

Andesitic Magma (Andesite Rock)

Question 10

composed of molten rocks, mineral such as iron, calcium, magnesium, silica and different gases such as water vapor, carbon dioxide, hydrogen sulfide, hydrochloric, and sulfuric acid.

Answer 10

Magma

Question 11

low in silica, contains magnesium iron and with low viscosity.

Answer 11

Mafic Magma

Question 12

high in silica, contains minerals such as quartz and feldspar, and with high viscosty

Answer 12

Felsic Magma

Question 13

large quantity of gast dust and ash, pyroclastic flow, and dense lava rolls down the volcano at high speed.

Answer 13

Pelean Eruptions