How Does Composition of Oceanic Crust Part 2: Pillow Lava, Dikes, Gabbro Work?

The ocean floor is built from layers like a cake, and one of the first layers is made of pillow lava, dikes, and gabbro, all created by molten rock rising up from deep inside Earth.

Imagine you're blowing bubbles in a glass of soda. When the bubble hits the surface, it makes a squishy, round shape, that’s like what happens with pillow lava. Deep under the ocean, molten rock (like hot soup) comes out and meets cold seawater. It cools quickly on the outside but stays hot inside, making those bubbly shapes we call pillow lava.

Now imagine you have a chocolate bar with thin lines of caramel running through it, that’s like what dikes are. They're long, narrow rock formations that cut through other rocks. They form when more molten rock pushes its way up through the already-cooled lava on the seafloor, creating those “veins” of new rock.

Underneath everything is gabbro, a kind of dense, dark rock, like a heavy, chunky cookie. It forms deep underground when molten rock cools slowly, giving it time to grow big crystals inside. This becomes the base of the oceanic crust, holding everything else together. The ocean floor is built from layers like a cake, and one of the first layers is made of pillow lava, dikes, and gabbro, all created by molten rock rising up from deep inside Earth.

Imagine you're blowing bubbles in a glass of soda. When the bubble hits the surface, it makes a squishy, round shape, that’s like what happens with pillow lava. Deep under the ocean, molten rock (like hot soup) comes out and meets cold seawater. It cools quickly on the outside but stays hot inside, making those bubbly shapes we call pillow lava.

Now imagine you have a chocolate bar with thin lines of caramel running through it, that’s like what dikes are. They're long, narrow rock formations that cut through other rocks. They form when more molten rock pushes its way up through the already-cooled lava on the seafloor, creating those “veins” of new rock.

Underneath everything is gabbro, a kind of dense, dark rock, like a heavy, chunky cookie. It forms deep underground when molten rock cools slowly, giving it time to grow big crystals inside. This becomes the base of the oceanic crust, holding everything else together.