Igneous Rock and Earth Movement
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Also we can tell an igneous rock that has large and numerous crystals is formed under the earth's crust and is called intrusive rock.
To sum up, igneous rocks that have small and few crystals were formed on the surface of Earth because they were cooled faster than intrusive rock.
And igneous rocks that have lots of crystals are formed underground by magma. They have lots of crystals because they take a longer time to solidify than extrusive rock.
Finally we have covered up all about volcanoes and igneous rocks.
Now we we will learn about Earth movement caused by tectonic plates.
The best place to learn about plate movement and about tectonic plates is the beach.
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