The cracks in the crust from which lava is released during a volcanic eruption are called vents.

Here's a little more detail:

* Vents are openings in the Earth's crust where magma rises from the mantle and erupts onto the surface as lava, ash, and gases.

* They can be small fissures or larger craters called craters or calderas.

* Fissure vents are long, linear openings that can extend for miles.

* Central vents are located at the center of volcanic cones and are typically associated with more explosive eruptions.

So, while the crust is where the cracks form, the vent is the specific opening where the lava erupts.