Igneous Rocks

Rock Cycle

Pyroclastic flow

New lava dome

Pahoehoe lava

Aa lava

Columnar joints

Vesicular lava

Mauna Loa

Illustration by J. Johnson

Whin Sill High Force

Tertiary dyke cuts Permian rocks: Arran

granite

basalt

dolerite

gabbro

peridotite