Sedimentary rock is comprised of sediment, as the name suggests. Over time, tiny minerals, sand, rocks, and debris layer on ...

The rock weathered along the joints, or cracks; the joints in turn became filled with soil created from that organic debris. This loose soil eroded away over time, leaving only the rounded boulders.

Metamorphic rocks form from a previously existing rock, be it igneous, sedimentary or even an older metamorphic rock. Rocks turn metamorphic when they are subjected to very high heat and pressure.

Sedimentary rock covers 75-80% of the Earth's crust, and it forms parent materials for a large majority of soils. Soil parent material has a significant direct influence on the nutrient element ...

During the nearly 14 months that it has spent on the red planet, Curiosity, the Mars Science Laboratory (MSL) rover, has scooped soil, drilled rocks, and analyzed samples by exposing […] ...

Find out how magma has created igneous rock features with this BBC Bitesize Scotland article for P5, P6, P7 - Second Level CfE ...

Silicates are the main ingredient in most igneous rocks, which form when volcanic material cools and hardens. Such rocks make up about 15% of Earth’s land surface .