* Sandstone to Obsidian: Sandstone is a sedimentary rock formed from cemented sand grains. Obsidian is a volcanic glass formed from rapidly cooled lava. These are fundamentally different rock types. The only way to transform sandstone into obsidian would be to melt the sandstone, which would completely destroy its original structure.
* Obsidian to Paste of a Conglomerate: Obsidian is a solid rock. A conglomerate is a sedimentary rock made of rounded pebbles and gravel cemented together. While obsidian can break down into smaller pieces, it wouldn't form the rounded pebbles characteristic of conglomerates.
* Paste of a Conglomerate to Obsidian: A paste of conglomerate is essentially just a mixture of crushed rock. Turning this into obsidian again would require extreme heat and pressure to melt and reform the material into volcanic glass.
In summary: The transitions you've described are not geologically plausible.
Here are some real examples of rock transformations:
* Sandstone to Quartzite: Under intense heat and pressure, sandstone can transform into quartzite, a metamorphic rock where the sand grains recrystallize.
* Magma to Obsidian: Magma (molten rock) can rapidly cool and solidify to form obsidian.
* Sedimentary Rock to Metamorphic Rock: Sedimentary rocks can be transformed into metamorphic rocks through heat and pressure deep underground.
Let me know if you have any more questions about how rocks change!