Here's a breakdown:
* Intrusions: These are formed when magma (molten rock) pushes its way into existing rock layers, cools, and solidifies. They can be various shapes and sizes, from thin sheets to massive bodies.
* Intrusive rocks: This refers to the rocks that form from these intrusions. They are often characterized by their coarse-grained texture due to slow cooling.
Example: A granite intrusion that forms a large, visible body within surrounding sedimentary layers.
Important Note: It's crucial to differentiate this from extrusive rocks, which form when lava flows onto the Earth's surface and cools quickly.
