Several metres (around 10 feet) high, the mustard-yellow wall has only one entrance, which is secured by the army. It cost 1.8 million euros ($2.2 million), according to official figures. "Before ...

Tanzania's outlandish Ol Doinyo Lengai volcano, the only volcano on Earth that is currently erupting carbonatite lava, has been sinking at a rate of 1.4 inches per year for the past decade.

Satellite data indicate that a magma reservoir about 1.4 miles (2.3 kilometers) beneath the crater began swelling in March 2022, suddenly stretching Earth's crust above it.