On December 16, 1707, scientists recorded the last confirmed eruption of Mount Fuji, Japan’s tallest mountain. Mount Fuji (actually, two volcanoes known as “Old Fuji” and “Young Fuji”) has erupted for more than 100,000 years—and is still an active volcano today.Mount Fuji’s last eruption ejected tons of tephra into the atmosphere. Tephra includes all solid volcanic material—not lava or volcanic gas. Tephra released by the 1707 eruption of Mount Fuji (called the Hoei eruption) included volcanic ash and volcanic rock such as pumice and scoria. The tephra was so thick that residents of the city of Edo (now known as Tokyo, more than 100 kilometers (62 miles) away) had to use candles in the middle of the day.
Term Part of Speech Definition Encyclopedic Entry active volcano Noun
volcano that has had a recorded eruption since the last glacial period, about 10,000 years ago.
layers of gases surrounding a planet or other celestial body.
Encyclopedic Entry: atmosphere city Noun
large settlement with a high population density.
to establish the truth or accuracy of a statement.
result or outcome of an action or situation.
harm that reduces usefulness or value.
to get rid of or throw out.
release of material from an opening in the Earth's crust.
molten rock, or magma, that erupts from volcanoes or fissures in the Earth's surface.
landmass that forms as tectonic plates interact with each other.
type of igneous rock with many pores.
to preserve observations with notes, drawings, photographs, audio or video recordings.
to lower or lessen.
any area on Earth with one or more common characteristics. Regions are the basic units of geography.
Encyclopedic Entry: region resident Noun
person who lives in a specific place.
type of rough, crusty volcanic rock.
to die from lack of food.
solid material ejected from a volcano during an eruption.
volcanic ash Noun
fragments of lava less than 2 millimeters across.
Encyclopedic Entry: volcanic ash volcanic gas Noun
gas such as water vapor or carbon dioxide that is released into the atmosphere by a volcano.
an opening in the Earth's crust, through which lava, ash, and gases erupt, and also the cone built by eruptions.
Encyclopedic Entry: volcano volcanologist Noun
scientist who studies volcanoes.