There are 3 large classifications of rocks - igneous, metamorphic, and sedimentary. Each type of rock is formed differently and can change from one type to another over time. The way rocks are formed determines how we classify them.
The rock cycle is an ongoing process.
Rocks in the rock cycle don't necessarily go in a "cycle." Any rock in the rock cycle can transform into any other type of rock (including a new version of itself) depending on the processes it undergoes in nature. Notice how each rock type can be transformed into any other type of rock in the rock cycle models below:
There are many different models available that represent the rock cycle
Below are just a few:
Video Guide:
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Video Guide:
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Topic Tip
- Always use the rock cycle models provided to find the correct answer and eliminate others.
- The rock cycle is a good example of how the Earth is dynamic and constantly still changing.