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
François Leguat Giant Tortoise and Cave Reserve yet rehabilitated. The reserve's tours include a trip through the caves, which are the only caves in the Indian ocean equipped with lights. Francois Leguat Reserve is located on the Anse Quitor peninsula in the south-west of the island, a few hundred meters from the Rodrigues airport and right beside Anse Quitor Nature Reserve (not yet open to the public). François Leguat Giant Tortoise and Cave Reserve François Leguat Giant Tortoise and Cave Reserve ("Francois Leguat Reserve") is a park and nature reserve on the island of Rodrigues, dedicated to protecting the fauna and flora of the island. The reserve