Download Ch 12 Vocabulary - Taylor County Schools

Ch 12 Vocabulary
Mid-Ocean Ridge (MOR) – Continuous system of
mountain ranges with a rift valley between them that extends around
Earth on the
. Formed at a
plate boundary.
Rift Valley –
, linear, dropped-down
between twin, parallel mountain ranges produced by faulting.
Divergent Boundary – Plate
moving
from each other.
where the plates are
Convergent Boundary – Plate boundary where the plates are moving
each other.
Subduction – Occurs when lithospheric plates
edge of one plate is forced downward
and the
another.
Transform Boundary – Plate
where the plates are
moving
to each other (one in one direction and the
other in the opposite direction).
Fault –
taken place
in Earth’s crust along which movement has
Focus –
of
of an earthquake
P-waves – Primary waves. The
and the
get to the surface of the Earth during an earthquake.
S-waves –
surface of the Earth.
wave to
waves. The second wave to reach the
Epicenter – Location directly
the
where the waves of an earthquake first meet the
Earth.
the
Shadow zone – “
” between
140 degrees from an earthquake’s epicenter where nothing is
recorded on a
.
Asthenosphere – The
Lithosphere – The
Viscosity – A fluid’s
and
.
and the upper
.
to
Cinder cone volcano – Small,
formed by accumulation of
around a
.
Shield volcano – Broad,
layers of free-flowing, high-temperature,
.
erupting volcano
pyroclastic materials
volcano formed by
lava.
Composite volcano – Volcano formed by alternating
flows and violently erupting
materials.
Hot spot – Volcanically active sites that arises in the
of a tectonic plate. Hot spots do not
.
Pyroclasts – Material expelled from a volcano that
becomes
as it falls to Earth.
and
Volcanic blocks –
of solid material ripped away
from the opening of the volcano and
into the air.
Lahar – Volcanic