Types of Igneous Rock
• There are two types of igneous rock:
Extrusive, which forms from lava that hardens on
Intrusive, which forms from magma that hardens
beneath Earth’s surface.
Lava Cools Quickly
and Hardens into
Molten Rock Above Surface (Lava)
Types of Sedimentary Rock
• There are three types of sedimentary rock:
Clastic, which is formed when rock fragments are
Organic, which forms when the remains of plants
and animals are deposited in thick layers.
Chemical, which forms when minerals that are
dissolved in a solution crystallize.
Types of Metamorphic Rock
• There are two types of Metamorphic rock:
Foliated, which is when the rock grains are
arranged in parallel layers or bands.
Nonfoliated, which is when the rock grains are