* Igneous rocks form from the cooling and solidification of molten rock (magma or lava).

* Holes in igneous rocks are called vesicles.

* Vesicles form when gases trapped in the molten rock escape as it cools.

So, whether an igneous rock has many small holes depends on:

* The amount of gas in the magma/lava: More gas means more potential for vesicles.

* The rate of cooling: Faster cooling traps more gas, leading to more vesicles.

* The type of igneous rock: Some types, like pumice and scoria, are naturally very vesicular, while others, like basalt, may have few or no vesicles.

Here's an example:

* Pumice is a very light, frothy igneous rock that has countless tiny holes from escaping gases. This is why it floats!

* Basalt is a dark, dense igneous rock that often has few or no vesicles.

In conclusion: While some igneous rocks are full of small holes, others have few or none. It depends on the specific conditions under which they formed.