What was going to move in his example? They will give you a model and then based on that. Means that you are your knowledge to a visual representation Asking you to the knowledge that you have.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

hope this