Here are the three primary rock types:
So first, rocks fall into a river.
Then, once the river loses force it gets deposited on the bank.
More piles up on top, causing it to get pushed into the earths crust.
The rock melts, turning into magma.
From here, there are two things that can happen:
The magma can cool slowly in the earths crust, or, it can cool quickly coming out of a volcano. This produces two different types of Igneous rock:
- Plutonic rock, which is cooled slowly in the earths crust.
- Volcanic rock, which is cooled quickly, since it comes out of volcanoes.
Now the cycle starts over!
Note: This process can happen in any order.