By TOO fast I assume you are asking why the glass breaks?
Cooling causes the molecules in the glass to loose energy. When hot the atoms are forced farther apart. As they cool they come closer together. This causes mechanical stress. If the difference in stress of adjacent areas becomes too great a fracture between the two areas occur.
Not enough information. Some crystals will break if they cool rapidly, some crystals will not form correctly if the solution cools too quickly.
Obsidian is an igneous rock that has a smooth glass-like texture. It is formed when lava cools rapidly without crystal formation, resulting in a glassy texture.
cools slowly.
Overall mineral crystal size depends on how fast a solution cools. Slower cooling allows more time for mineral crystals to grow larger, while rapid cooling results in smaller crystal sizes. Additionally, the chemical composition of the solution and the presence of impurities can also influence crystal size.
When molten rock cools quickly, fine-grained crystals form. This happens because there is not enough time for larger crystals to grow before the rock solidifies, resulting in smaller crystals being formed.
small
Not enough information. Some crystals will break if they cool rapidly, some crystals will not form correctly if the solution cools too quickly.
Due to lack of humidity and cloud cover, the desert cools rapidly after sunset.
Obsidian is neither an element nor a compound. It is a naturally occurring volcanic glass formed when lava cools rapidly without crystal growth.
crystal
Fine crystal grain.
Obsidian is an igneous rock that has a smooth glass-like texture. It is formed when lava cools rapidly without crystal formation, resulting in a glassy texture.
both the water and soil heats up but the soil heats up rapidly and the water heats up slowly. If it cools down the soil cools down faster and the water cools down slower.
if lava cools slowly, it will have a lot of crystals. When it cools fast, there will be little to no crystals what s ever.
"Larger than if it cools quickly" is about all that's definitively possible to say.
coarse texture
Fine