Geography

Mount St. Helens was continuously active until 2008.

The archipelago belongs to Ecuador.

The methane gas floats on the water's surface as many tiny bubbles. The density of the resulting gas-water mixture is much less than that of seawater. If a ship finds itself in such an area, due to the lower density, it quickly sinks below the actual sea surface, and the crew is unable even to make an emergency call. The ship sinks.

The archipelago is located in the western part of the Galapagos Submarine Ridge (an undersea ridge made of volcanic rocks and characterized by volcanic activity), on the Nazca Plate, which moves southeast at a rate of about 6.4 cm per year. 

Strombolicchio is in fact a volcanic plug - a hardened magma that filled the ancient volcano's vent. Erosion has caused the terrain around the vent to disappear, but a strong and enduring lava neck proudly rises above the waters of the Tyrrhenian Sea, reminding us of a long-gone volcanic mountain.

On March 1st, 1980, a new seismographic system was installed by the University of Washington in order to monitor seismic activity in the Cascade Arc.

Montana became the first state to elect a woman to federal office.

The length of the coastline of Asia is 62,800 kilometers (39,022 mi).

The River Thames is divided into tidal and non-tidal sections.

A cable car can transport the mountaineers half way to the top.