This image shows different types of igneous intrusions that may form as magma travels through Earth’s crust. A dike — like the one underneath Grindavík and the Sundhnúka Craters — forms when magma cuts across layers of rock. Credit: Motilla via Wikimedia commons, CC-BY-SA-3.0, adaptations by Melissa Scruggs

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This image shows different types of igneous intrusions that may form as magma travels through Earth’s crust. A dike — like the one underneath Grindavík and the Sundhnúka Craters — forms when magma cuts across layers of rock. Credit: Motilla via Wikimedia commons, CC-BY-SA-3.0, adaptations by Melissa Scruggs

This image shows different types of igneous intrusions that may form as magma travels through Earth’s crust. A dike — like the one underneath Grindavík and the Sundhnúka Craters — forms when magma cuts across layers of rock. Credit: Motilla via Wikimedia commons, CC-BY-SA-3.0, adaptations by Melissa Scruggs

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