Object Based Learning

Types of Rocks

There are three main types of rocks: sedimentary, igneous, and metamorphic. Each of these rocks are formed by physical changes—such as melting, cooling, eroding, compacting, or deforming—that are part of the rock cycle.

Thumbnail of 'Acasta Gneiss'

Acasta Gneiss

Thumbnail of 'Andalusite-Biotite Hornfels'

Andalusite-Biotite Hornfels

Thumbnail of 'Cross-laminations in Sandstone'

Cross-laminations in Sandstone

Thumbnail of 'Fossiliferous Limestone'

Fossiliferous Limestone

Thumbnail of 'Granite'

Granite

Thumbnail of 'Ignimbrite'

Ignimbrite

Thumbnail of 'Olivine Basalt'

Olivine Basalt

Thumbnail of 'Shale or Siltstone'

Shale or Siltstone

Thumbnail of 'Conglomerate'

Conglomerate

Thumbnail of 'Garnet-Wollastonite Hornfels'

Garnet-Wollastonite Hornfels

Thumbnail of 'Garnet-Chlorite Schist'

Garnet-Chlorite Schist

Thumbnail of 'Gabbro'

Gabbro