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Igneous rock = Igneous rocks are formed when molten magma cools and are divided into two main categories: plutonic rock and volcanic. Plutonic or intrusive rocks result when magma cools and crystallizes slowly within the Earth's crust (example granite), while volcanic or extrusive rocks result from magma reaching the surface either as lava or fragmental ejecta (examples pumice and basalt).
Intervisibility = term used to show the mutual visibility between sites, usually with the corresponding style of monument. May indicate a social and political relationship between neighbouring monuments and their people.
Iron Age = final period of prehistory, beginning around 500 BCE and lasting into the early centuries of the first millennium AD. Iron superseded bronze as popular material for the manufacture of tools and weapons.
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