A boiling spring (hot spring) is ‘a spring of naturally hot water, typically heated by underground volcanic activity.
Facts about hot springs:
- The water is warmed by heat from under the Earth.
- Some are pleasantly warm and used by people for bathing and relaxing.
- Hot springs have been used by people for thousands of years for relaxation and enjoyment. Ancient civilizations often built bathhouses around hot springs.
- Some are so hot, going into them would hurt or kill a person.
- Hot springs can vary in temperature from just a few degrees above the average air temperature to over 200 degrees Fahrenheit (93 degrees Celsius).
- Hot springs can be so hot that they can actually cook food! People have been known to boil eggs in certain hot springs.
- The water in hot springs can be rich in minerals such as sulfur, calcium, magnesium, and silica.
- The minerals in hot springs can create colorful rock formations and terraces, making them look like otherworldly landscapes.
- The term “hot spring” is often used interchangeably with “thermal spring” or “thermal water.”
- Hot springs are formed when water is heated by volcanic activity or by geothermal heat from deep within the Earth’s crust.
- Hot springs have been used for geothermal energy production to generate electricity in some areas.
- Some hot springs have vibrant colors, like the Grand Prismatic Spring in Yellowstone National Park, which looks like a giant rainbow!
- The colors seen in some hot springs are caused by the presence of thermophilic (heat-loving) bacteria and algae.
- Did you know that some animals, like monkeys and snow monkeys in Japan, love to take baths in hot springs too? They use them to keep warm during cold weather.
- Some hot springs have unique names, like “Devil’s Bathtub” or “Fairy Hot Spring,” which make them sound even more exciting to visit.
- Hot springs are not just found on land! There are also underwater hot springs called hydrothermal vents, where hot water and minerals are released from the ocean floor.
Did you know the center of the Earth is blazingly hot? The deeper under the Earth’s surface, the hotter it gets. The center of the Earth is a solid ball of hot metal, surrounded by a liquid sea of melted metal (see the picture below). This energy is what warms the water of boiling springs.


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