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Four basic processes are involved in the formation of a clastic sedimentary rock: weathering (erosion)caused mainly by friction of waves, transportation where the sediment is carried along by a current, deposition and compaction where the sediment is squashed together to form a rock of this kind.
Then under pressure (normally of the continued depositing of more layers of rock and sand above it), the particles compress together to form a sedimentary rock layer. Again this process can take tens of millions of years. An example of this is Granite, which is an igneous (magma-type) rock, on weathering and reconstitution it can become sandstone.