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Oceanic crust is about 6 km (4 miles) thick. It is composed of several layers, not including the overlying sediment. The topmost layer, about 500 metres (1,650 feet) thick, includes lavas made of basalt (that is, rock material consisting largely of plagioclase [feldspar] and pyroxene).
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1.この本はいくらですか?その本は1000円です。
2.これは私の本です。
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Hello, can anyone speak Turkish and how do I learn Turkish easily?
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