A divergent plate boundary is a boundary at which two tectonic plates move away from each other. As the plates move apart, magma rises upward between them and erupts onto the ocean floor as lava. This lava cools quickly to form solid rock. Over time, these hardened lava flows build up on top of each other and are uplifted by tectonic forces to form mid-ocean ridges. Based on this information, what type of rock are mid-ocean ridges made of? metamorphic rock sedimentary rock igneous rock eroded rock

Igneous rocks are rocks that form when magma or lava cools and hardens. Igneous rock that forms above the Earth's surface is extrusive. Igneous rock that forms below the Earth's surface is intrusive.

When magma erupts as lava onto the ocean floor at a divergent boundary, the lava cools quickly to form extrusive igneous rock. Over time, these hardened lava flows build up on top of each other and are uplifted by tectonic forces to form mid-ocean ridges.