Geology.com offers many pictures of rocks, divided into their fundamental categories of igneous, metamorphic and sedimentary. The igneous rock section divides the rocks into extrusive and intrusive types, with special sections for gabbro, peridotite, tuff and others. The metamorphic rocks are divided into foliated and non-foliated rocks, with 10 separate sections focusing on marble, schist, gneiss and other rocks.
Geology.com further divides sedimentary rocks into clastic, chemical and organic types, with a dozen sections devoted to conglomerate rocks, limestone, siltstone and more.
In addition, the site offers pictures of rocks and explanations of special phenomena regarding rocks such as the sliding rocks of racetrack playa. Further pictures are available of rocks on Mars, which appear to be very similiar to rocks on Earth. Another section offers pictures of lava, explaining and showing how a rock can be molten and liquid.
One gallery of pictures features types of sand from all over the world, with photos of exotic orange, green, black and white sands, among others. A separate photo gallery shows the beauty of individual grains of sand. Another close-up set of photos focuses on the beauty of coal when seen through a microscope.
One further startling photo gallery shows a rockfall at Yosemite National Park, along with the accompanying debris avalanche.Learn More
Rocks have a broad range of uses that makes them significantly important to human life. For instance, rocks are used in construction, for manufacturing substances and making medicine and for the production of gas. Rocks are also extremely vital to scientists as they provide clues about the Earth’s history.Full Answer >
Humans use rocks for a wide variety of purposes, including construction and as a source of valuable minerals located inside the rocks. Additionally, humans use rocks for decoration, recreation and thermal purposes. Humans are not the only organisms that utilize rocks, as plants, animals and fungi use rocks for stability, digestive purposes and as a substrate.Full Answer >
Rock is the primary component of the Earth's crust. Although soil, sand and other natural materials are similar to rocks, they are not actually rocks and are classified as derivatives of rocks. Minerals are necessary to form nearly all types of rock, and most include more than one mineral. Metals are also found in many rock types.Full Answer >
The most common type of igneous rock, basalt, also known as malfic rock, can be found on oceanic plates at divergent plate boundaries. Intermediate and felsic igneous rocks show up along continental margins, as well. Because igneous rocks form from the cooling of lava and magma, they can be found around areas where volcanic activity is or has been present.Full Answer >