. Because their mineral grains grew together tightly as the melt cooled, they are relatively strong rocks. They're made of primary minerals that are mostly black, white, or gray. Any other colors they may have are pale in shade. Their textures generally look like something that was baked in an oven.

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The even texture of coarse-grained is familiar from building stones or kitchen counters. Fine-grained lava may look like black bread (including gas bubbles) or dark peanut brittle (including larger crystals). At divergent boundaries, like, plates drift apart and form gaps that are filled by magma. Subduction zones occur whenever a dense oceanic plate is subducted underneath another oceanic or continental plate. Water from the descending oceanic crust lowers the melting point of the above mantle, forming magma that rises to the surface and forms volcanoes.

At continental-continental convergent boundaries, large landmasses collide, thickening and heating the crust to melting., like Hawaii, form as the crust moves over a thermal plume rising from deep in the Earth. Hot spots form extrusive igneous rocks.

Igneous delivers the only Unstructured Data Management as-a-Service solution, giving data-centric organizations visibility, protection, and data mobility at scale, wherever datasets and workflows live. B: relating to, resulting from, or suggestive of the intrusion or extrusion of magma or volcanic activity Examples of igneous in a Sentence Recent Examples on the Web Recently, a paper by Jones and his collaborators in Birmingham removed the last major doubt and showed that igneous activity was indeed the principal driver of the warming.