(Specific) heat capacity.
Use particle theory of matter to describe what happens to the density of a substance when it cools down
A fan.
rock cools quickly from melted rockRock cools quickly from melted rock.
thermal energy
Pumice would fit the description of a gas filled extrusive igneous rock that cools quickly.
Specific heat capacity is the amount of energy required to increase the temperature of an object or substance by 1oK. The rate at which something cools is proportional to the difference in temperature between the object and its surroundings. Consequently, neither has any relation to the other.
Lava will cool quickly compared to underground magma.
The density of the substance becomes higher because of the particles slow down and move closer together when the substance cools.
When lave cools fairly quickly, but not instantaneously, the rock that is producing will have small or nearly invisible crystalsform.
The object that cools more slowly would have the greater specific heat, because the amount of heat that is needed to raise the temperature of it one degree is less than the amount of heat needed to raise the temperature of the first object one degree. i.e. the object that cools quickly does so because it doesn't need a lot of heat to increase the temperature of it by one degree and the one that cools more slowly does so because it needs more heat to increase the temperature of it by one degree.
Thermal energy
When a substance cools, it loses thermal energy to its surrounding environment.