extrusive

Example Sentences

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When lava is extruded onto the surface, or intruded into shallow fissures near the surface and cools, the resulting igneous rock is called extrusive or volcanic.

From Textbooks • Jan. 1, 2017

Andesite is a fine crystalline intermediate extrusive rock.

From Textbooks • Jan. 1, 2017

In some cases, extrusive lava cools so rapidly it does not develop crystals at all.

From Textbooks • Jan. 1, 2017

Basalt and gabbro are the extrusive and intrusive names for mafic igneous rocks, and peridotite is ultramafic, with komatiite as the fine-grained extrusive equivalent.

From Textbooks • Jan. 1, 2017

Thus, granite is an igneous, intrusive rock; lava is an igneous, extrusive rock.

From Let's Collect Rocks and Shells by Shell Union Oil Corporation