There are three main types of volcano-composite or strato, shield and dome. Composite Volcanoes. Composite volcanoes, sometimes known as strato volcanoes, are steep sided cones formed from layers of ash and [lava] flows. The eruptions from these volcanoes may be a pyroclastic flow rather than a flow of lava.
A vagal episode or vasovagal response or vasovagal attack (also called neurocardiogenic syncope) is a malaise mediated by the vagus nerve. When it leads to fainting, also known as a syncope, it is called a vasovagal syncope, which is the most common type of fainting.
Vagus Nerve Stimulation. Sudden stimulation of a vagus nerve can produce what is called a vasovagal reflex, which consists of a sudden drop in blood pressure and a slowing of the heart rate. This reflex can be triggered by gastrointestinal illness or in response to pain, fright or sudden stress. Read about vasovagal syncope.