What Causes Volcanoes? 11/9/ pgs IN: What causes volcanoes?
Formation of Magma Solid rock may become magma when: pressure is
released, when the temperature rises above its melting point, or
when its composition changes. Nonexplosive Volcano Lava flows come
from nonexplosive eruption. Explosive Volcano Clouds of hot debris
and gases shoot out from the volcano often at supersonic speeds.
Shield volcanoes nonexplosive Cinder cone volcanoes explosive
Composite volcanoes explosive and then nonexplosive Near tectonic
plate boundaries. Where do volcanoes form? Divergent Boundaries -
when tectonic plates separate. Rift deep crack between plates Not
this Divergent, Lexi! Where do volcanoes form? Convergent
Boundaries - when tectonic plates collide. Subduction Zones Where
do volcanoes form? Hot Spots places on the Earths surface that are
directly above columns of rising magma, called mantle plumes.
Hawaii Animation Predicting Volcanic Eruptions Measuring Small
Quakes Measuring Slope Measuring Volcanic Gases Measuring
Temperature Classifying Volcanoes Extinct will never erupt Dormant
may erupt Active are erupting OUT: Why are most volcanoes on
tectonic plate boundaries?
