Volcanoes come in all shapes and sizes, so there's no single answer to how tall they are! Here's a breakdown:

Height depends on several factors:

* Type of volcano: Shield volcanoes, built from flowing lava, tend to be very wide and relatively low. Cinder cone volcanoes, formed from explosive eruptions, are typically smaller and steeper. Stratovolcanoes, with alternating layers of lava and ash, can be quite tall.

* Eruptive history: A volcano that has been active for a long time will generally be taller than one that has only erupted a few times.

* Erosion: Weather and erosion can wear down a volcano's height over time.

Examples of volcano heights:

* Mauna Kea (Hawaii) is the tallest volcano on Earth, measuring 33,500 feet from its base on the ocean floor to its summit, although only 13,796 feet are above sea level.

* Mount Kilimanjaro (Tanzania) is the tallest free-standing mountain in the world, reaching 19,341 feet above sea level.

* Mount Fuji (Japan) is a classic stratovolcano and a popular tourist destination, standing at 12,388 feet.

* Paricutin (Mexico) is a cinder cone volcano that erupted in 1943, reaching a height of 1,391 feet.

So, the answer to your question is: Volcanoes can be anywhere from a few hundred feet tall to over 30,000 feet!