Chapter 4 Volcanoes. caldera A large circular depression, or basin, at the top of a volcano.
Transcript of Chapter 4 Volcanoes. caldera A large circular depression, or basin, at the top of a volcano.
Chapter 4Chapter 4VolcanoesVolcanoes
calderacalderaA large circular
depression, or basin, at the top of a volcano
cinder cone cinder cone volcanovolcano
a kind of volcano, usually small and steep-sloped, that is formed from layers of cinders which are sticky bits of volcanic material
composite cone composite cone volcanovolcano
A kind of volcano formed when explosive eruptions
of sticky lava alternate with quieter eruptions of
volcanic rock bits
hot spothot spotA place deep within Earth’s
mantle that is extremely hot and contains a chamber of magma
island arcisland arcA chain of volcanoes
formed from magma that rises as a result of an
oceanic plate sinking into the mantle
lavalavaMagma that flows out onto
Earth’s surface from a volcano
magmamagmaThe hot molten rock deep inside the earth
riftingriftingThe process by which magma rises to fill the
gap between two plates that are moving apart
seismometerAn instrument that detects and records
Earth’s movements
shield volcanoshield volcanoA kind of volcano that is large
and gently sloped and that is formed when lava flows quietly from a crack in the
earth’s crust
volcanovolcanoAn opening in Earth’s crust through which hot gasses, rock fragments and molten
rock erupt