14 Volcano Fun Facts You’ll Want to Know

Volcanoes are some of nature’s most awe-inspiring creations. They demonstrate the immense power within our dynamic planet. When a volcano erupts, it can alter landscapes in the blink of an eye. Volcanoes also enrich the environment by bringing up minerals and gases from deep within the Earth.

Learning about volcanoes gives us insight into the inner workings of our world. Read on to discover 14 fascinating volcano fun facts that will leave you captivated!


Volcanoes have inspired fear, wonder, and scientific curiosity throughout human history. Their seemingly random eruptions can impact people living nearby, while also providing nutrients that nourish ecosystems. Volcanoes reveal the constant changes happening below Earth’s surface.

In this article, we will explore some of the most interesting facts about volcanoes. You’ll learn what causes them to erupt, the different types that exist, and how they impact our planet. Understanding volcanoes provides a glimpse into the powerful geologic forces that shape the ground beneath our feet.

1. There are over 1,350 active volcanoes on Earth

The majority of Earth’s volcanoes are located along the Pacific Ring of Fire, a 25,000-mile horseshoe-shaped zone that follows the edges of the Pacific Ocean. Currently, there are over 1,350 active volcanoes on land across the globe 1. An active volcano has erupted recently and may erupt again soon.

Some of the world’s most closely monitored active volcanoes include:

  • Kilauea in Hawaii
  • Mount Etna in Italy
  • Popocatépetl in Mexico
  • Mount Merapi in Indonesia

2. Volcanic eruptions can be explosive or calm

Volcan Chaiten X región, Chile
Volcan Chaiten X región, Chile by bilobicles bag is licensed under CC BY-NC 2.0 .

Not all volcanic eruptions are explosive events that blast ash miles into the sky. Some eruptions ooze out lava in a gentle, calm manner. The explosiveness of an eruption depends on the composition of the magma, and the amount of gases it contains.

  • Effusive eruptions occur when runny, low-viscosity magma quietly flows onto the Earth’s surface as lava. This type of eruption is common at shield volcanoes like those in Hawaii.
  • Explosive eruptions happen when thick, sticky magma traps gas bubbles. The bubbles burst violently, breaking magma into fine ash and fragments that get blasted upward. Explosive eruptions are typical of stratovolcanoes like Mount St. Helens.

3. Volcanic eruptions can trigger tsunamis

Besides spewing lava and ash, volcanic eruptions can generate terrifying tsunamis. Underwater volcanoes sometimes produce explosions that displace massive amounts of water.

In 1883, the eruption of Krakatoa in Indonesia triggered tsunamis up to 130 feet high, killing over 36,000 people. More recently, an eruption of the Anak Krakatau volcano (the “Child of Krakatoa”) caused a tsunami in 2018 that killed 430 people.

4. Volcanoes produce more than just lava

Flowing lava in Hawaii
Flowing lava in Hawaii

Lava may be the first thing that comes to mind when picturing a volcano, but eruptions can generate all kinds of geologic products:

  • Tephra: Airborne fragments of volcanic rock and lava
  • Volcanic ash: Fine, powdery shards of volcanic glass and minerals
  • Volcanic bombs: Fist-sized chunks of rocky material
  • Lahars: Fast-moving mudflows containing volcanic debris

Understanding the diversity of volcanic materials provides clues into the eruption style. For example, a lahar indicates the volcano’s hot deposits rapidly melted snow and ice.

5. Mauna Loa is the largest volcano on Earth

Mauna Loa is the world's largest active volcano
Mauna Loa is the world’s largest active volcano by NASA Johnson is licensed under CC BY-NC-ND 2.0 .

The mammoth Mauna Loa volcano in Hawaii holds the title of the largest volcano on Earth 2. It rises 13,679 feet above sea level, but over half of the volcano is underwater. From seafloor to summit, Mauna Loa measures 56,000 feet tall!

Despite its enormous size, this gently sloping shield volcano tends to erupt non-explosively, producing rivers of lava that slowly flow downhill. Fast-moving lava from Mauna Loa once threatened the city of Hilo.

6. Volcanic eruptions impacted human evolution

Scientists think past volcanic eruptions influenced the evolution of our species. Homo erectus individuals who invented better tools and hunting strategies to deal with harsh volcanic winters may have gained an evolutionary edge.

Major volcanic events also affected human history. In the year 536 CE, an obscure eruption triggered a decade of cold summers that led to crop failures, famine, and plagues around the world.

7. Volcanoes create new land

Although volcanic eruptions can destroy landscapes, they also construct new terrain. Repeated eruptions built the Hawaiian Islands from the seafloor. Lava flows from the Kilauea volcano continuously expand Hawaii’s Big Island.

Underwater volcanoes called seamounts emerge from the ocean as islands. Over time, coral reefs may grow around a volcanic island, forming an atoll such as the Maldives in the Indian Ocean.

8. Volcanic soil is very fertile

Volcanic eruptions have a silver lining: They produce nutrient-rich soils that sustain abundant plant growth. Fluorine and other minerals in volcanic ash fertilize the soil. Lava and tephra break down into rich, clay-like soils.

Farmers often cultivate lands around volcanoes. For example, vineyards thrive in the fertile soils near Mount Etna in Italy and Mount Vesuvius in Italy.

9. Volcanic gases influence Earth’s climate

Volcanoes release gases that influence our planet’s climate and environment. Eruptions emit carbon dioxide (CO2), sulfur dioxide (SO2), hydrogen sulfide (H2S), hydrogen (H2), and water vapor (H2O).

CO2 and H2O are greenhouse gases that trap heat. SO2 converts to sulfate aerosols that reflect sunlight and cool the planet. While eruptions cause short-term cooling, volcanoes ultimately emit CO2 that warms Earth’s climate over millennia.

10. Volcanoes may have sparked life on Earth

Bárðarbunga Volcano, September 4 2014
Bárðarbunga Volcano, September 4 2014 by peterhartree is licensed under CC BY-SA 2.0 .

Volcanic activity may have provided the spark that allowed life to develop on Earth. Hydrothermal vents – cracks in the seafloor where volcanic heat and gases escape – could have synthesized the organic molecules that led to the first life forms.

Today, microbial communities still thrive in the hot, mineral-rich waters around hydrothermal vents. These unique ecosystems run on chemical energy rather than sunlight.

11. Volcanic lightning happens during eruptions

The powerful forces inside a volcanic plume generate lightning in the ash cloud. Volcanic lightning results from the interaction between ash particles and ice crystals, which creates charge separation.

During the 2018 eruption of Anak Krakatau in Indonesia, the volcanic plume produced frequent lightning flashes, captured in dramatic photographs.

12. Lava can destroy almost anything in its path

Lava may creep along at only a few miles per hour, but its immense heat makes it capable of destroying almost anything. Lava can incinerate wood, ignite grass, melt plastic, and burn through metal.

Flowing lava has overwhelmed forests, villages, and infrastructure. Its unstoppable progress and destructive power fascinate yet alarm eyewitnesses and geologists alike. Nothing can halt lava’s advance once it starts moving.

13. Volcanic smog can circle the entire planet

Powerful volcanic eruptions can inject sulfur dioxide high into the stratosphere, where it undergoes chemical reactions to produce a haze of sulfuric acid droplets known as volcanic smog or vog.

The aerosols that makeup vog reflect sunlight and can linger for a few years, cooling the global climate. In 1991, Mount Pinatubo’s eruption in the Philippines produced a vog that circled the Earth in just 3 weeks.

14. Undersea volcanoes host bizarre creatures

At underwater hydrothermal vents, seawater infiltrates cracks in the seafloor, heats up, and dissolves minerals from the Earth’s crust. This creates hot, acidic, mineral-rich fluid that supports unique ecosystems.

Giant tube worms, blind shrimp, clams, and microbes are among the weird creatures that cluster around deep sea volcanic vents. These oases nurture life in the darkness of the seafloor.


Our planet contains untold numbers of volcanoes, from active peaks to hidden calderas deep in the oceans. Volcanoes reveal the constant churning and changing within Earth. Their eruptions can create or destroy, and impact climate and life in complex ways.

Learning about volcanoes provides a window into the incredible forces operating inside our dynamic world. The volcano fun facts shared here are just a glimpse of what makes volcanoes such a captivating force of nature. Their beauty, power, and planetary impacts will continue inspiring awe and scientific study for generations to come.


  1. How many active volcanoes are there on Earth? usgs.gov[]
  2. Where is the largest active volcano in the world? usgs.gov[]