300 



FIRST YEAR SCIENCE 



sea, shells are dug up very similar to those now found on 

 the shore. Some inland strips of land are found com- 

 posed of sand and pebbles like a beach and having the beach 

 slope. Sometimes tree trunks standing with their roots 

 in the ground just as they do on the dry land are seen at a 

 considerable depth in the sea. It can be proved that an 



INLAND SEA CAVE AND BEACH. 

 This coast has been recently elevated. 



old temple near Naples, Italy, has stood above and then 

 in the sea more than once since it was built. 



Facts like these show that the sea coast is not stable, 

 but subject to upward and downward movements, some of 

 which are slight and some great. If the land near the sea 

 rises, the coast line is moved into the area which was for- 

 merly covered by the water and if the land sinks, a new coast 

 line is formed where before the hills and valleys of the 

 land appeared. Changes of this kind have a marked effect 



