Earth's Structure

Science

A dark, dense igneous rock

Basalt

A dark, dense igneous rock. Basalt. Basalt is a volcanic rock formed from the rapid cooling of lava at Earth's surface.

A process where sediment grains are cemented together

Cementation

A process where sediment grains are cemented together. Cementation. It is when minerals fill the spaces between sand grains, gluing them to form solid rock.

Sedimentary rock that forms when rock fragments are squeezed together, like sandstone

Clastic rock

Sedimentary rock that forms when rock fragments are squeezed together, like sandstone. Clastic rock. Clastic rocks are formed from pieces of other rocks compacted and cemented together.

The process by which sediments are compressed by the weight of layers above

Compaction

The process by which sediments are compressed by the weight of layers above. Compaction. In simple terms, compaction is when layers of sediment are pressed together tightly over time.

the process of dropping sediment by water or wind

Deposition explained in an easy to understand way.

the process in which rock is worn away and transported by water, wind or ice

Erosion explained in an easy to understand way.

Igneous rock that forms when lava cools on Earth's surface

Extrusive rock

Igneous rock that forms when lava cools on Earth's surface. Extrusive rock. Extrusive rock is formed from lava that cools quickly on the Earth's surface, creating fine-grained textures.

Metamorphic rocks with mineral grains arranged in parallel layers

Foliated

Metamorphic rocks with mineral grains arranged in parallel layers. Foliated. Foliated means that the mineral grains in the rock are aligned in flat, parallel layers.

A light-colored igneous rock

Granite

A light-colored igneous rock. Granite. Granite is a type of rock formed from cooled and solidified magma, made mostly of minerals like quartz and feldspar.

Igneous rock that forms when magma hardens beneath Earth's surface

Intrusive rock

Igneous rock that forms when magma hardens beneath Earth's surface. Intrusive rock. Intrusive rock is a type of igneous rock that solidifies from magma beneath the Earth's surface.

the rock that forms when existing rock is changed by heat, pressure, or chemicals

Metamorphic rock explained in an easy to understand way.

Metamorphic rock with mineral grains not arranged in layers

Nonfoliated

Metamorphic rock with mineral grains not arranged in layers. Nonfoliated. In simple terms, nonfoliated rocks have mineral grains that are randomly arranged, not in layers or sheets.

a process that changes rocks from one form to another

Rock cycle explained in an easy to understand way.

Particles of rock and other materials deposited by water or wind

Sediment

Particles of rock and other materials deposited by water or wind. Sediment. Sediment is the tiny pieces of rock and remains that settle at the bottom of bodies of water or are carried by the wind.

Sedimentary rock explained in an easy to understand way.

A deposit that hangs from the roof of a cave

Stalactite

A deposit that hangs from the roof of a cave stalactite. Stalactites are icicle-shaped formations created by mineral-rich water dripping and depositing minerals from the ceiling of a cave over time.

A cone-shaped deposit that builds up from the floor of a cave

Stalagmite

A cone-shaped deposit that builds up from the floor of a cave. Stalagmite. A stalagmite is a mineral formation that grows upward from the floor of a cave as minerals from dripping water accumulate over time.

The size, shape, and grains of a rock

Texture

The size, shape, and grains of a rock. Texture. Texture is the feel or appearance of a surface, determined by the size and arrangement of its particles.