The order in which rocks are formed on Earth is a bit more complex than a simple list. It's best understood as a cycle called the Rock Cycle. Here's a simplified breakdown:

1. Igneous Rocks:

* Magma/Lava: Igneous rocks are formed from the cooling and solidification of molten rock (magma) beneath the Earth's surface or lava on the surface.

* Intrusive Igneous Rocks: Magma cools slowly underground, resulting in large crystals (e.g., granite).

* Extrusive Igneous Rocks: Lava cools quickly on the surface, resulting in small crystals (e.g., basalt).

2. Sedimentary Rocks:

* Weathering and Erosion: Igneous rocks (and other rocks) are broken down into smaller pieces by wind, water, and ice.

* Transportation and Deposition: These fragments are transported by wind, water, or ice and deposited in layers.

* Compaction and Cementation: Over time, the layers are pressed together (compacted) and glued together by minerals (cemented), forming sedimentary rocks (e.g., sandstone, limestone).

3. Metamorphic Rocks:

* Heat and Pressure: Existing igneous, sedimentary, or even other metamorphic rocks are transformed by intense heat and pressure deep within the Earth.

* Recrystallization: The minerals within the rock rearrange and change form, creating metamorphic rocks (e.g., marble, slate).

Important Points:

* The cycle is continuous: Rocks are constantly being transformed from one type to another.

* The order isn't strict: A metamorphic rock can be weathered and eroded to form sedimentary rock, or an igneous rock can be buried and become metamorphic.

Let me know if you'd like a diagram or a more detailed explanation of the Rock Cycle!