big raw specimen dark basalt rock isolated white background extrusive igneous volcanic |
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| navigate by keyword : basalts common aphanitic igneous extrusive volcanic rocks occur types social mineral prefix raw isolated white background stone coal black ore geology carbon piece macro fuel crystal nature material natural fossil granite lava mining volcano specimen grey cutout scoria pyroclastic highly vesicular dark colored crystals colour magnesium bakground sedimentary composed calcium carbonate constructed gray texture magma molten cools crystallizes volcanoes surface earth melted inside crust siltstone formed pre existing pieces once living organisms deposits accumulate big basalt rock produced exits |
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| Extrusive, or volcanic, igneous rock is produced when magma exits and cools above (or very near) the Earth's surface. |
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