Rock, sand, or dirt that has been carried away to a place by water, wind or a glacier.

Sedimentary rock is naturally formed in the Earth’s crust. It is formed when sediment deposits form layers, compact, and then cement together, creating a new rock. Sedimentary rocks are used for building materials, and sometimes they even contain fossils.

Igneous rock forms from melted rock (magma). Magma exists inside the earth’s surface, and it becomes lava when it is released through a volcanic eruption. When it cools, that is when it becomes igneous rock.

Cooling

Melting

Metamorphic rocks are rocks that have been changed either in texture or in mineral composition by the influence of heat, pressure, stress (directed pressure), chemically active solutions or gasses or some other agent without the rock passing through a liquid phase. Any rock type (sedimentary, igneous or other metamorphic) can be subjected any one or any combination of the referenced agents.

Heat & pressure

VVH

Compactation & Sedimentation

Weathering & Erosion

Melting

Heat & pressure

Weathering & Erosion

Bibliography

https://studyjams.scholastic.com/studyjams/jams/science/rocks-minerals-landforms/metamorphic-rocks.htm https://www.rocksandminerals.com/rocks/metamorphic-rocks.htm

Sebastian Castillero

Igneous rocks:

The igneous form of rocks does not include any fossil deposits. ...

Most of the igneous forms include more than one mineral deposit.

They can be either glassy or coarse.

These usually do not react with acids.

Characteristics

Examples:

Andesite

Basalt

Sedimentary Rocks

Bedding. Bedding is often the most obvious feature of a sedimentary rock and consists of lines called bedding planes, which mark the boundaries of different layers of sediment.

Graded beds are common when a sediment is being deposited by a slow‐moving current.

Fossils.

Desiccation cracks and ripple marks.

Sandstone

Limestone

Metamorphic Rocks

Examples

Marble

Quartzite