Rock Types

Grade 3 · Science · Flashcards

Practice vocabulary for the three types of rocks and how they are formed.

Flashcards

Igneous Rock: Rock formed when melted rock (magma or lava) cools and hardens. Example: granite, obsidian.
Sedimentary Rock: Rock formed when layers of sediment (sand, mud, shells) are pressed together over time. Example: sandstone, limestone.
Metamorphic Rock: Rock formed when existing rock is changed by heat and pressure deep in the Earth. Example: marble, slate.
Magma: Melted rock found beneath Earth's surface.
Lava: Melted rock that has reached Earth's surface through a volcano.
Sediment: Tiny pieces of rock, sand, shells, and other materials that settle in layers.
Rock Cycle: The continuous process by which rocks change from one type to another over millions of years.
Mineral: A natural solid material that makes up rocks. Rocks are made of one or more minerals.
Granite: A common igneous rock made of visible crystals; used in buildings and countertops.
Limestone: A sedimentary rock often containing fossils of ancient sea creatures.
Marble: A metamorphic rock formed from limestone under heat and pressure; used in sculptures and floors.
Fossil: The preserved remains or imprint of an ancient living thing, often found in sedimentary rock.