A crater
The steep walled depression surrounding a volcano vent is called the crater. In dormant volcanos, these may fill with water and become crater lakes.
A bowl-shaped depression that forms around the vent of a volcano is a crater. These craters can be formed by the explosion of volcanic material or the collapse of the volcanic cone following an eruption.
The central depression is called a crater, or more technically a "caldera."
The opening at the top of a volcano is called the "vent." This is where magma, gases, and ash escape from the volcano during an eruption. The vent may lead to a larger crater, which is the bowl-shaped depression that forms around the vent after eruptions.
The steep walled depression surrounding a volcano vent is called the crater. In dormant volcanos, these may fill with water and become crater lakes.
Volcanic crater.
The mouth of a volcano is called the "vent." This is the opening through which volcanic materials, such as lava, ash, and gases, are expelled during an eruption. Vents can vary in size and may occur at the summit or along the sides of the volcano. In some cases, the vent can lead to a crater, which is a bowl-shaped depression formed around the vent.
A volcanic vent.
If the volcano is active, there may be vents around the volcano as well as on top. A vent is where volcanic material (lava, steam, ash) is being released.
The bowl-shaped area around a volcano's central vent is called a crater. Craters are formed by explosive volcanic activity that creates a depression at the summit of the volcano. They can vary in size and shape depending on the eruption and the type of volcano. Some craters may also fill with water, forming a crater lake.
A volcanic vent. There may also be a crater (a concave depression or pit). This is known as a volcanic vent. It may sit at the base of a volcanic crater.
If you look at the volcano side ways that little curve on top is called a cradle i think