extrusive , plutonic, volcanic, below surface, granite, intrusive, plutonic, volcanic, basalt, above surface, basalt forms at _____________ boundaries, destructive, transform, constructive, convergent, rock at Mid Atlantic Ridge, granite, limestone, shale, basalt, Age of Caledonian orogeny, 65 mya, 250 mya, 350 mya, 450 mya, not a mineral in granite, mica, feldspar, quartz, calcium carbonate, basalt, intrusive, extrusive, plutonic, basalt, volcanic, plutonic, intrusive, county with granite, Clare, Antrim, Cork, Wicklow, silica content of granite, 50%, 60%, 70%, 80%, crystals in granite are, microscopic, small, large, cooled to form granite, magma, lava, depth that a subducting plate melts at, 250 km, 300 km, 400 km, 500 km, rate of annual divergence along M.A.R, 1 cm, 2.5 cm, 4 cm, 6 cm, blobs of lava along M.A.R, volcanoes, guyots, hot spots, pillow lavas, shape of columns at Giant's Causeway, octagons, pentagons, hexagons, silica content of basalt, high, low, tertiary period, 65 mya, 250 mya, 350 mya, 450 mya, not a mineral in basalt, olivine, magnesium, iron, calcium carbonate, crystals in basalt, large , small, a tear in the crust, escarpment, reverse fault, volcano, fissure, density of basalt, 2.5 g/cm3, 3g/cm3, 3g/cm, 2.5g/cm, lava that forms basalt, basic, acidic, felsic, mafic, proposed theory of sea-floor spreading, Arthur Holmes, Alfred Wegener, Harry Hess, Formed from large lava flows, Wicklow Mts, Antrim Derry Plateau, The Burren, plates either side of M.A.R, eurasian & South American, North American & Eurasian, South American & Nazca, what makes lava viscous, iron, zinc, silica, a large deep body of granite, lopolith, batholith, sill, dyke, another word for acidic, mafic, felsic, basic, another word for basic, acidic, felsic, mafic.

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