Extrusive is when Igneous rock is formed from magma below Earth's surface.
evaporation
large crystals (that form from volcanoes) form when lava under ground gets separated from the main lava chamber and begins slowly cooling. Smaller crystals form when either, one: Volcanoes erupt and lava cools, or two: Lava under ground gets separated from main lava chamber close to the surface and cools fairly quickly.
Rapid precipitation occurs when crystals form quickly from a solution, while recrystallization involves the gradual rearrangement of molecules to form larger crystals. Rapid precipitation can lead to smaller, less organized crystals, while recrystallization typically results in larger, more pure crystals with a more defined structure.
Crystals formed from slow cooling typically have larger crystal sizes due to more time for the atoms to arrange in an ordered structure. This results in minerals with well-defined crystal faces and clearer textures, as seen in intrusive igneous rocks like granite and gabbro.
Crystals tend to be large if they form slowly either from the melt or from solution. Intrusive igneous rocks are formed when magma forces its way between existing rocks and then gradually cools and sets. The surrounding rocks provide good insulation, so the magma cools very slowly, and big crystals, such as those in granite, are formed. Chemical sedimentation processes vary, but are usually more rapid than intrusive igneous cooling.
the reterded mineral
super fine grained rock
rapid cooling, so that crystals do not form.
no . they come from rapid cooling lava
No, pumice is a volcanic rock that forms from the rapid cooling of magma containing high concentrations of gas. This rapid cooling prevents large crystals from forming, resulting in a frothy texture with tiny air bubbles, rather than interlocking visible crystals.
Fine-grained
The resulting texture of extremely rapid cooling of lava, where no crystals form, is known as glassy or obsidian texture. This type of texture is smooth, with no visible crystal structures, and can appear shiny or reflective. Glassy textures typically form when lava cools very quickly at the Earth's surface or in water.
The size of crystals decreases as the cooling increases. This is called an inverse relationship.
Rapid cooling of lava with tiny crystals forming results in a fine-grained texture, like that of basalt. This texture is characterized by small mineral grains that are difficult to see with the naked eye.
False. Large crystals typically form from slow cooling of a solution, which allows molecules to arrange themselves into a well-defined crystal structure. Rapid cooling tends to produce smaller crystals or even amorphous solids, as the molecules do not have enough time to organize properly.
They are said to have a glassy or vitreous texture.
As the rate of cooling increases, the size of the crystals that form generally decreases. This is because rapid cooling does not allow sufficient time for crystals to grow to a larger size. Slower cooling rates allow for more orderly arrangement of atoms, leading to larger crystal formation.