Igneous rock (derived from the Latin word ignis meaning fire), or magmatic rock, is one of the three main rock types, the others being sedimentary and metamorphic. Igneous rock is formed through the cooling and solidification of magma or lava. Igneous definition, produced under conditions involving intense heat, as rocks of volcanic origin or rocks crystallized from molten magma.

Dike, also called dyke or geological dike, in, tabular or sheetlike body that is often oriented vertically or steeply inclined to the of preexisting intruded; similar bodies oriented parallel to the bedding of the enclosing rocks are called. A dike set is composed of several parallel dikes; when the number of dikes is large, the term dike swarm is used. Dikes have a wide range of. They commonly have a, i.e., larger within a finer-grained groundmass, indicating two periods of crystallization. Dike Dike set along the Baranof Cross-Island Trail, Baranof Island, Alaska, U.S. Jonathan.s.ktAlthough dikes may range in size from a few centimetres to greater than 10 metres (about 33 feet) in width, they average between 0.3 and 6 metres (between about 1 and 20 feet) wide.

The length of a dike usually depends upon how far it can be traced across the surface; dikes can be up to hundreds of miles long. The world’s longest dike is the Great Dike of Zimbabwe, which stretches for more than 550 km (about 342 miles) southwest to northeast across the centre of the country. This article was most recently revised and updated by, Editor. Witch spells that actually work.