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
Secret of the Cave events and deeds begin to occur and rumors of ghosts sweep the village. All these things are pointing to something mysterious that is going on in a nearby cave. Roy sets out to disprove the rumor and decides to explore the cave with his new, teenage local friends Oscar (Gareth O'Connor) and Abbey (Niamh Finn). Roy faces his fears and discovers the secret of the cave. The film is based on the 1920 children's book of the same name by Arthur S. Maxwell (also known as "Uncle Arthur"). The book has sold more than 142,000 copies worldwide in English, Spanish,