Why does obsidian have no crystals? Why is radiometric dating not accurate for sedimentary rocks? Why are alloys useful? Why are chemical radicals important in mineralogy? Why is glass not a mineral? How does rock type contribute to geological research?
Why does obsidian have no crystals? Why is the freezing of water called a physical change? Why does a solid change to liquid when heat is added? How do temperature sensitive liquid crystals work? Why don't liquid crystals dry up in TVs?
They had plenty of time to slowly cool into large crystals in the hot environment at depth. However, some igneous or tectonic process suddenly shoved the magma body up towards the surface. This made the rest of the magma cool suddenly. Because these newer crystals did not have time to grow...
Why does obsidian have no crystals? Why do extrusive rocks have small crystals? Why is the lithosphere important? Why is igneous petrology important? Why are metamorphic rocks formed by contact metamorphism? Why do crystalline solids form?