Eruptions 14.2

Question 1

magma

Answer 1

liquid rock produced under Earth’s surface

Question 2

making magma

Answer 2

• A volcanoes explosion depends on the composition of the magma

Question 3

What are the three conditions magma can form under?

Answer 3

Temperature, pressure, and the addition of water. `

Question 4

Magma forming under temperature

Answer 4

• most rocks form between 800 C-120 C
• the presence of water helps dissolve gases and can affect the formation of magma

Question 5

Magma forming under pressure

Answer 5

• pressure increases with depth because of the weight of overlying rocks.
• pressure increase= temperature a substance melts also increases.

Question 6

lava

Answer 6

magma that flows onto Earths surface

Question 7

Mafic (type of magma)

Answer 7

describes magma or igneous rock that is rich on magnesium and iron andthat is generally dark in color; commonly makes up oceanic crust

Question 8

Felsic

Answer 8

describes magma or igneous rock that is rick in feldspar and silica and that is generally light in color; commonly makes up continental crust.

Question 9

viscosity

Answer 9

describes a material’s resistance to flow.
low viscosity= quiet eruptions

Question 10

Quiet Eruptions