The magnitude of the Mount Pinatubo eruption is commonly described in terms of its Volcanic Explosivity Index (VEI), which is a scale used to measure the relative explosiveness of volcanic eruptions.

Mount Pinatubo's eruption in 1991 had a VEI of 6, placing it among the most powerful volcanic eruptions in recorded history.

Here's what that means:

* VEI 6: Large eruptions with a volume of ejected material between 1 and 10 cubic kilometers. These eruptions can have significant global effects, including climate change and widespread damage.

Other ways to describe the magnitude of the eruption include:

* Ejected material: The eruption ejected an estimated 5 cubic kilometers of material, primarily ash, into the atmosphere.

* Plume height: The eruption column reached a height of 40 kilometers (25 miles), injecting massive amounts of sulfur dioxide into the stratosphere.

* Global impact: The eruption had a significant global impact, cooling the planet by about 0.5 degrees Celsius (0.9 degrees Fahrenheit) for several years.

It's important to remember that while a VEI of 6 is extremely powerful, there are even larger volcanic eruptions with higher VEI ratings.