The core heats up the lava and it becomes less dense rising up, once it gets further away from the core it begins to cool and becomes magma. The cycle repeats but sometimes there is too much pressure and there is a break in the crust forming a volcano.
The hot spot and all its pressure under the crust was too strong to hold underneath, so instead the magma shot out of the hole in the crust, this caused the magma to crystallize and become a Igneous rock.
After the volcano erupts spewing lava. The Lava cools into magma and the magma cools down and becomes ingnous rock that forms a Mountain.
On that mountain, a Glacier melted and an avalance occured with it. That water poured into the ocean.
The water evaporated with dust within it. The water vapor crystallizes or condensing causing clouds.
The moisture in the cloud gets to dense causing rain to become compacted and gets pulled down by gravity. The water and the soil then mix together.