Hierarchical database model This model allows the data to be structured in a parent/child relationship (each parent may have many children, but each child would be restricted to having only one parent). Under this model, it is difficult to express relationships when children need to relate to more than one parent. When the data relationships are hierarchical, the database is easy to implement, modify and search. A hierarchical structure has only one root. Each parent can have numerous children, but a child can have only one parent. Subordinate segments are retrieved through the parent segment. Reverse pointers are not allowed. Pointers can be set only for nodes on a lower level; they cannot be set to a node on a predetermined access path. Network Database Model This model allows children to relate to more than one parent. A disadvantage to the network model is that such structure can be extremely complex and difficult to comprehend, modify or reconstruct in case of failure. The network structure is effective in stable environments where the complex interdependencies of the requirements have been clearly defined.

TASK;

1.how is Flashed steam system applied in water in high temperature range

2.propose the range for the degrees of salinity

3.in regard to thesurface subsidence,elaborate on the withdrawal of large amounts of steam from a hydrothermal reservoir impacts

4. How much percent of Non-condensable gases are contained in steam?explain

5.show the operating principle of the Cooling towers

6.eanumearte on the range that isefficient for the Hydro thermal wells

7.explain the integration of the Through fissures to the hot water or steam escape

8.project on to when there is a rise in the hydrothermal resources

9.relate the350oC to the temperature at Hydro thermal reservoirs and the dominant product.

10. How many known geothermal areas are there in India? elaborateeach