Igneous rock the partial melting of rocks within the mantle and crust. Extrusive igneous rocks cool and solidify quicker than intrusive igneous rocks. They are formed by the cooling of molten magma on the earth's surface. The magma, which is brought to the surface through fissures or volcanic eruptions, solidifies at a faster rate. Hence such rocks are smooth, crystalline and fine-grained. Basalt is a common extrusive igneous rock and forms lava flows, lava sheets and lava plateaus. Some kinds of basalt solidify to form long polygonal columns. The Giant's Causeway in Antrim, Northern Ireland is an example. The molten rock, with
Cave of the Ramban Cave of the Ramban The Cave of the Ramban is located in the southern cliff of the Upper Kidron Valley, on a slope descending into the Arab neighborhood of Wadi al-Joz, Jerusalem. It is believed by some to be the traditional burial place of Nahmanides (also known as Ramban), a foremost rabbinical scholar during the medieval era. The large rock-hewn cave, measuring 19 by 20 m, reaches a height of 3.5 meters and is supported by two columns. The area once functioned as an ancient underground stone quarry. Above the façade, in the upper portion of the cliff, are the