Shale forms from the pressure of layers of sediment compressing bits of silt that settle into the clay on the bottom of bodies of water. The compressed clay and silt become shale over time. Shale is a sedimentary rock.Know More
Shale starts with bits of rock that erode off of larger rocks from contact with moving water and the weather. Very fine particles of feldspar, quartz, mica, pyrite and other minerals settle to the bottom of still bodies of water, such as swamplands, deep parts of the ocean and deep, still lakes. The fine rock particles mix with decaying organic matter into a mud. Because weathering is a continual process, new layers are always building up. The top layers press on the bottom layers with more and more pressure. When enough pressure builds up, the bottom layers become rock through a process called lithification. Lithification causes the thin layers that are characteristic of shale.
Shale is a soft rock that breaks easily. The color varies depending on the exact minerals that formed the shale. Red, green and black are some color variations. Geologists classify shale as a claystone due to the small size of the particles that form the rock. Shale is a common rock that makes up much of Earth's crust.Learn more about Geology
Shale is made of silt and very fine minerals that settle to the bottom of a body of water to form a laminated rock. The materials that form silt are the same that form mud. While shale is a mudstone, the laminates create fissures that differentiate it from other mudstones.Full Answer >
Shale is a sedimentary type of rock. Sedimentary rock is formed when tiny particles of sand, pebbles or other fragments of material gather in layers, hardening over time.Full Answer >
Archipelagos form when underwater volcanoes continually produce molten magma that cools and builds up to eventually form a group of islands. Although archipelagos can form by erosion or by the movement or evaporation of water, volcanic activity is the most common cause of archipelago formation.Full Answer >
Clay is a soft, earthy material made up of a number of minerals rich in alumina, silica and water. Clay can also contain other minerals that affect the characteristics of the clay.Full Answer >