magnitude
tsunami
volcano
earthquake
epicenter
mild
volcanic
focus
explosive
tectonic
volcanic eruption
(1)
are the rumbling, shaking, or rolling of
the Earth's surface. (2)
earthquake occurs when two
tectonic plates move suddenly against each other. (3)
earthquake occurs in areas that are associated with volcanic
activities. (4)
is the energy released by the earthquake
form its focus. The ground around above the focus is called the
(5)
A (6)
is a huge wave produced when an
earthquake occurs under the sea.
A (7)
is an opening in the earth's crust where
lava, pyroclasts, and gases are ejected onto the surface during
eruptions (8)
begins when pressure on the magma
chamber forces magma up through the conduit and out the volcano's
vents.
The greater the viscosity of the magma, the more difficult
it is for the gases to escape from it. In this case, the eruption is a
one, releasing huge volumes of tephra.Basaltic magma
has relatively low silica content. It is less viscous and gases can
escape readily from it. As a result, the volcanic eruption is
(10)
and a gentle flow of lava follows.
(9)​