What are granite intrusions?

Granite intrusions are like big chunks of hardened soup that got stuck inside a cake while it was baking.

Imagine you're making a cake, and while it's still soft in the oven, someone pours a big bowl of hot soup right into the middle of it. The soup is granite magma, which is like melted rock deep underground. The cake is the surrounding rock, maybe something like sandstone or shale. When the soup (magma) cools down inside the cake, it turns into solid granite.

Granite intrusions happen when this hot soup of granite magma pushes its way up through cracks in the Earth’s crust and gets trapped there, kind of like how a lava lamp works. Over time, the soup cools down and hardens, creating big, strong chunks of granite inside the older rock.

If you look at some mountains or cliffs, you might see these intrusions, they often stand out because they're harder and lighter in color than the rocks around them. It's like finding a frozen soup bowl inside your cake!