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Mountain Building
SHAPE
All mountains have a history and there are many features of a mountain
that provide information about that history.
ROCK COMPOSITION
The shapes of mountains
vary significantly.
A rock's environment can
modify it or completely
transform it into something
else.
The shape of a mountain provides
evidence about its formation and history.
The shape of non-volcanic
mountains is determined
by their tectonic setting.
The shape of volcanoes
is determined by the
viscosity of the magma.
Where plates collide,
compressional forces
cause folded and thrust
fault mountains.
Where plates are
pulling apart, tensional
forces result in fault
block mountains.
LOCATION
Mountains composed entirely of
volcanic rocks might be, but are
not necessarily, volcanoes.
Lesson 2
As plates move around
over geologic time, plate
boundaries change,
resulting in modern day
mountain belts that are
far from present-day
plate boundaries.
Erodability is
determined by
a rock's
resistance to
mechanical
and chemical
weathering.
Rocks have
identifying
characteristics
that provide
evidence of
the changes
that they have
endured.
Three main
categories are
igneous,
sedimentary,
and
metamorphic.
Geologic forces that form and
shape mountains are both
constructive and destructive.
Mountains tend to form near plate
boundaries in long ranges that parallel
the boundaries.
Volcanoes form over
subduction zones as
continuous arc-shaped
chains of volcanoes of
different sizes.
Lesson 1
Erosion
changes rocks
by breaking
them down
and moving
them to
different
environments.
Rocks are
categorized
based on the
most recent
major change
that occurred
to them.
CONSTRUCTIVE AND
DESTRUCTIVE
FORCES
Erosion is a destructive force that
sculpts and shapes all mountains.
Mountains are usually made up of many types of rock.
Some rock types erode more easily than others, producing
differential rates of erosion in neighboring rocks.
Differential erosion of rocky material produces jagged
mountains as well as batholiths, mesas and buttes.
Lesson 3
Lesson 4
Lesson 5
Lesson 6