Volcanoes and Igneous Rocks

Front

What is the mineral composition of mafic igneous rocks?

Back

Mafic igneous rocks are rich in magnesium and iron, typically containing minerals like olivine, pyroxene, and plagioclase.

Front

What type of volcano is characterized by broad, gently sloping sides and primarily erupts low-viscosity lava?

Back

Shield volcanoes are characterized by broad, gently sloping sides and primarily erupt low-viscosity lava.

Front

What type of magma is typically associated with subduction zones and forms stratovolcanoes?

Back

Andesitic magma is typically associated with subduction zones and forms stratovolcanoes.

Front

What is the texture of glassy igneous rocks?

Back

Glassy igneous rocks have a smooth, shiny texture due to rapid cooling of lava.

Front

What type of lava is commonly found in shield volcanoes?

Back

Basaltic lava, which is low in viscosity, is commonly found in shield volcanoes.

Front

What is the primary characteristic of felsic igneous rocks?

Back

Felsic igneous rocks are rich in silica and contain minerals like quartz and feldspar.

Front

What is the difference between mafic and felsic rocks?

Back

Mafic rocks are rich in magnesium and iron, while felsic rocks are rich in silica and aluminum.

Front

What type of volcano is formed from explosive eruptions and has steep sides?

Back

Composite volcanoes are formed from explosive eruptions and have steep sides.

Front

What is the significance of the viscosity of lava in volcanic eruptions?

Back

The viscosity of lava affects the eruption style; low-viscosity lava leads to gentle eruptions, while high-viscosity lava leads to explosive eruptions.

Front

What is a cinder cone volcano?

Back

A cinder cone volcano is a small, steep-sided volcano formed from the accumulation of volcanic debris and ash.