What is Kawah Ijen?

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About Kawah Ijen

Kawah Ijen is a volcanic crater lake located in East Java, Indonesia.
It is part of the larger Ijen volcano complex, which includes several other craters.
The main attraction of Kawah Ijen is its stunning turquoise-colored crater lake.
The vibrant color of the water is due to the high concentration of dissolved sulfuric acid and other minerals.
The lake is the largest, highly acidic crater lake in the world.
The lake has been included in UNESCO’s World Biosphere Reserves.
The Ijen volcano complex is still active, and Kawah Ijen is one of the areas where volcanic activity is observed.
The volcano releases sulfur gases, which can be ignited and produce impressive blue flames, especially at night. These flames are often referred to as “blue fire.”
The area around Kawah Ijen is known for traditional sulfur mining.

Key Facts Copernicus Sentinel-2 Mission

It is a European wide-swath, high-resolution, multi-spectral imaging mission.
It comprises a constellation of two polar-orbiting satellites placed in the same sun-synchronous orbit, phased at 180° to each other.
It aims at monitoring variability in land surface conditions, and its wide swath width (290 km) and high revisit time (10 days at the equator with one satellite and 5 days with 2 satellites under cloud-free conditions which results in 2-3 days at mid-latitudes) will support monitoring of Earth’s surface changes.

Q1) What is a crater?

A crater is a bowl-shaped depression or hollow in the ground or on the surface of a celestial body, such as the Moon, a planet, or even an asteroid. Craters are typically formed by the impact of objects from space, such as meteoroids, asteroids, or comets, striking the surface.

Source: Acid cauldron on Earth: World’s largest acidic lake looks spooky from space