Answer:
First magma cools down or maybe (crystallizes ?) To form igneous rocks. These igneous rocks are carried away by wind and seas and from all the forces of nature, the rocks go through lot of weathering and turn into sediments of rocks (thus the name) and then these sediments collide with other to form layers. Later on, some rocks that go underground have to go thru lot of heat and pressure due to which any sedimentary or igneous rocks underground take formation of metamorphic rocks. If there is a lot of heat, some metamorphic rocks melt down to go back to square 1.. magma.
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