A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that
allows hot lava ... Erupting volcanoes can pose many hazards, not only in the
immediate vicinity of the eruption. ...
A volcano begins as melted rock (magma) which rises from deep inside the earth
toward the surface. As the gas-filled magma rises ...
Volcanoes erupt because of density and pressure. The lower density of the
magma relative to the surrounding rocks causes it to rise (like air bubbles in
Volcanic eruptions occur when magma builds up beneath the Earth's crust and
forces its way to the surface. Natural vents in the crust allow magma passage to ...
Jan 5, 2015 ... The eruption of a volcano can be one of the planet's most destructive events —
spewing huge amounts of rock, gas and ash that can kill people.
How many volcanoes erupt every day? ... How does a volcano build up the
pressure to erupt? The magma ... How can you tell if a volcanic eruption might
Eruptions can cause lateral blasts, lava flows, hot ash flows, mudslides,
avalanches, falling ash and floods. Volcano eruptions have been known to knock
A secondary school revision resource for GCSE Geography covering key facts
about volcanoes and volcanic eruptions.
Volcanic activity frequently occurs at the boundaries of the Earth's tectonic plates
... An eruption can be preceded by hundreds of small earthquakes know as ...
A volcano is a geological feature of the earth where an opening allows magma to
escape from the mantle of the planet.