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