Answer;
The liquid mantle flowing through the cracks in Earth's crust during volcanic eruptions.
Explanation;
- The Earth’s crust is the outermost layer of our planet and is less than 1% of the entire Earth's size. There is the crust and then the mantle and they both contain different kinds of rocks which make them different to each other.
- The crust of the Earth is composed of a great variety of igneous, metamorphic, and sedimentary rocks. The crust is underlain by the mantle