The Rock Cycle
Science: KS3, topic 2.5.6
The Rock Cycle
Rocks do not stay the same. They are constantly changing. But this may take millions of years.
The rock cycle
- There are lots of changes to rocks inside the Earth and on its surface.
- These changes lead to the three main types of rock.
- Sedimentary.
- Igneous.
- Metamorphic.
Making sedimentary rock
- Rocks that are exposed to the atmosphere are worn away into smaller pieces.
- Weathered rock is then eroded or moved by rivers, wind or ice.
- These smaller pieces of rock are then transported and deposited into the ocean.
- Sedimentary rock is formed on the sea bed.
Making metamorphic rocks
- Sedimentary rocks are layered on top of each other.
- Under intense heat and pressure these sedimentary rocks form metamorphic rocks.
Making igneous rocks
- Sedimentary or metamorphic rocks are heated by the Earth’s core until they melt.
- We call this liquid rock magma and it can be found in the mantle.
- When this liquid rock cools, it forms igneous rock.
- This can happen on the Earth’s surface after a volcanic eruption pushes the magma out.
Test yourself on The Rock Cycle
Sedimentary Rock
Metamorphic Rock
Igneous Rock
What is not a main type of rock?
What happens to sedimentary rock that is heated and squeezed deep underground but does not melt?