The two important processes involved in lithification of sedimentary rocks are compaction and cementation.
Fresh sediment is usually loose material filled with open spaces or pores filled with air or water. Lithification serves to reduce this pore space and replace it with solid mineral material. The main processes involved in lithification are compaction and cementation.
Compaction compresses the sediment to a smaller volume by packing the sediment particles more tightly, removing water from the pore spaces, or by reducing the pressure at the sediment particle contact points. Cementation involves filling the pore spaces with solid minerals that are either deposited from solution or allow particles of existing sediment to grow into the pores.
The name of the volcano is SANTORINI. Santorini is an island in Greece and this name is used to called the volcano which occurred there. Santorini is an a dormant and active volcano; its last eruption was in 1950. The volcano of Santorini is a very famous volcano in Greece and it has the highest crater in the world.
