Igneous rocks13

Igneous rocks13
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Igneous rocks
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Igneous Rocks Solidified molten rock – 1,100 C to 650 C – Depends on composition Earth is mostly igneous rock – Magma – Subsurface melt – Lava – Melt at the surface Magma erupts via volcanoes
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Igneous rocks Rock texture – size, shape, orientation of minerals Composition – minerals that compose the rock
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Igneous rock textures
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Igneous rock textures Phaneritic Aphanitic Porphyritic Glassy Vesicular Pyroclastic
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Igneous rock textures
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Intrusive igneous rocks
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Extrusive igneous rocks
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Igneous rock composition Felsic (high silica) Intermediate (medium silica) Mafic (low silica)
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Art 05.03b1
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Texture? A. Phaneritic B. Aphanitic C. Porphyritic D. Pyroclastic
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Igneous Activity Distribution Igneous activity tracks tectonic plate boundaries
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Igneous Activity Distribution Igneous activity tracks tectonic plate boundaries. Hot spots – Mafic volcanic activity Convergent boundaries – Felsic igneous activity Divergent boundaries – Mafic igneous activity
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source of heat inside the Earth? A. Gravitational energy from the Sun
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