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## Hornblende

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## Hornfels

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## Hudson Bay

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## Humite

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## Kalahari Desert

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## Kaliophilite

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## Kuroshio

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## Lamprophyre

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## Landslide

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## Laplace transform

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## Laplace's differential equation

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## Laplacian

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## Laterite

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## Lattice (mathematics)

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## Lava

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## Lawsonite

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## Lazurite

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## Least-squares method

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## Legendre functions

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## Lemniscate of Bernoulli

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## Lepidolite

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## Leucite rock

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## Lidar

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## Lignite

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## Limonite

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## Line integral

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## Lithosphere

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## Loess

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## Magnetic reversals

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## Magnetite

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## Magnetosphere

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## Malachite

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