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Sea- Floor Spreading molten material erupts through the valley that runs along the center of some mid-ocean ridges. This material hardens to form the rock of the ocean floor. Mid-ocean ridges an undersea mountain chain where new ocean floor is produced.

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What rocks form when magma cools and hardens?

Igneous rock is what forms when magma cools and hardens.


When magma cools and hardens does it form igneous rock sedimentary rock or metamorphic rock?

igneous rock.


When melted rock erupts from a volcano and hardens what kind of rock does it form?

Extrusive igneous rock.


What is molten rock that flows onto the seafloor and hardens as it cools?

Molten rock that flows onto the seafloor and hardens as it cools is called basalt. Basalt is the most common type of lava erupted at mid-ocean ridges and forms the oceanic crust.


What rocks form when magma or lava hardens and cools?

Igneous rock.


How does intrusive rock form?

intrusive rock froms when magma cools or hardens underneath the earth. :)


When lava explodes from a volcano and cools and hardens quickly, what kind of rock does it form from?

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What is lava cuts through rock layers and then hardens to form a feature called?

Lava that cuts across rock layers hardens to form a disk.


Where is divergent boundary found?

Most divergent boundaries are found beneath the oceans . Mid-ocean ridges form at these divergent boundaries . Because the plate s are pulling away from each other , cracks form in the lithosphere .Melted rock can rise through these cracks . When the melted rock cools and hardens , it becomes new lithosphere.


What is the feature that is formed when lava cuts across rock layers and hardens?

Lava that cuts across rock layers hardens to form a feature called a Dike.


What type of feature can form when magma hardens horizontal layers of rock?

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What is the rock formed from molten rock?

Igneous rock Explanation:because when it comes out a volcano it turns to lava and when it hardens then it will form an extrusive igneous rock specifically