Transcript Topic 6- Volcanoes

Terrific heat, chocking ash, and stream of
molten lava all occur when a volcano erupts.
Have you watched
the movie Dante’s
Peak? Imagine what
they went through.
An opening in Earth’s crust that can release
materials such as lava, smoke, and ash;
volcanoes can either be active or dormant
Arenal Volcano (Active) in Costa Rica
Summit Cone of Sangay,
Dormant Volcano, Ecuador
Vents- openings of volcanoes
Mauna Kea, in Maui
Volcanoes are dormant when they are
not active. Scientist try to figure out
when they will erupt to prevent damage
and death.
Most active volcano on Earth is Kilauea in
Hawaii. Has been continuously erupting
since 1983.
Volcanoes can also be created when rock surfaces
beneath the Earth’s crust push against one another.
The part pushed downwards is heated up, it melts
and becomes magma. When there is so much
magma it is forced upwards through openings.
Mount St. Helens, in Washington.
In 1980, scientists
knew it was going
to erupt because
the side of the
volcano bulged
outwards. The
eruption actually
blew up the side of
the mountain.
It has been
dormant since
1944. But it is
expected to
blow and
when it does it
will be very
dangerous
because the
opening has a
rock plug that
will require a
lot of pressure
to force it out.
Mount Vesuvius in southern Italy.
The volcanoes around the pacific ocean make up the
“Ring of Fire”.
Comes from a circle of volcanoes that pour out
red hot lava, fire and steam- Goes from New
Zealand to Asia, then down the west coast of
North America and South America.
Mount
Pinatubo is
part of the
Ring of Fire.
In 1991 in the Philippians, Mount
Pinatubo’s ash formed a layer within the
Earth’s atmosphere that circled the globe
and cooled temperatures around the
Volcano on Venus.
Volcano on Jupiter’s moon
There are volcanoes on our moon and on Mars that
are extinct. On Jupiter’s moons they are still active.
The largest volcano found in the solar
system is Olympus Mons on Mars.
600km across and 25km tall.