Which of the following processes is associated with the ejection of magma and other related materials from deep below the Earth onto the Earth's surface?

The process that is associated with the ejection of magma and other related materials from deep below the Earth onto the Earth's surface is called vulcanicity. Vulcanicity is a geological process that involves the movement of molten rock, ash, and gases from the Earth's mantle and crust to the surface through volcanic eruptions. During vulcanicity, pressure builds up in the magma chamber, and when it becomes too great, it causes the magma to be ejected from the volcano. This process can result in the formation of various landforms such as mountains, craters, and lava flows. So, the correct option is Vulcanicity.