Igneous Rocks Made from Magma and Lava Igneous

Igneous Rocks Made from Magma and Lava

Igneous rocks ¬ How are igneous rocks formed? ¬ What do igneous rocks look like? ¬ What do the characteristics tell us about the rock? ¬ What are igneous rocks used for? ¬ How do you use page 6 of the ESRT for Igneous rocks?

Igneous Rocks ¬Rocks that form from solidification of magma or lava (crystallizes)

Texture ¬Intrusive or plutonic - inside the earth’s crust, magma chambers. ¬Large crystals (>1 mm)

Texture ¬ Extrusive or volcanic - lava on the earth’s surface. ¬ Small or no crystals (< 1 mm)

What do igneous rocks look like? ¬ Texture can be glassy, fine grained, coarse grained, or very coarse grained

What do igneous rocks look like? ¬Vesicular = gas bubbles (extrusive) Or ¬Nonvesicular = no gas bubbles

Composition ¬ Felsic light in color and density, rich in aluminum (continental crust) or ¬ Mafic dark in color and high in density, rich in iron and magnesium (ocean crust)

Classification (ID) ¬ Crystals (YES!) ¬ Intrusive or Extrusive – Cooled slowly in the crust = large minerals Intrusive – Cooled rapidly on the surface = no or very small minerals Extrusive – Vesicular = very gaseous lava flow ¬ Color: Light(Felsic) or dark (Mafic)

What are igneous rocks used for?

How to use esrt page 6 - Igneous Rocks?