Download E1.a Constructive Forces

Constructive
Forces
S5E1 Students will identify
surface features of the Earth
caused by constructive and
destructive processes.
a. Identify surface features
caused by constructive
processes.
Depositions (sand dunes,
deltas, etc)
Earthquakes
Volcanoes
Faults
Created for TCSS
Deposition
 Weathering
is when rocks and soil are worn
down.
Erosion is when the material that is worn down
is carried away by wind, water, living beings or
gravity. Deposition occurs when those
materials stop moving and build up
somewhere else. This is a constructive force.
 Deltas and sand dunes are examples of
deposition.
 Click here to watch a video clip about river
formation.
 Click here to watch a video clip about sand
dunes.
Earthquakes
 Earthquakes
can be both a constructive
and destructive force. When the fault lines
move they often cause incredible
damage but they also can cause new
land formations which is a constructive
force.
 Earthquakes can form mountains or lakes.
Click here to watch: Animation of
Earthquake and Tsunami in Sumatra (0:25)
Volcanoes
 Volcanoes
can be a constructive force.
 Volcanic islands are formed as magma
erupts from the sea floor. As the tectonic
plate moves, new islands are formed
through the same hotspot.
 As tectonic plates move apart, magma
rises to the surface creating new land.
Click here to watch: Volcanoes 101(3:04)
Faults
 The
part where the plates touch is
called a fault. Plates bump, scrape,
and push against each other at the
faults which causes earthquakes
and volcanoes.
 There are many different types of
faults, which are created
depending on how the tectonic
plates collide.
Faults
 Mountains
form where the crust is
crumpled and pushed upward by the
movement of plates.
 The Appalachian Mountains are mostly
the result of faults folding and thrusting
upwards.
 The Ridge and Valley region and the Blue
Ridge Mountains were built up by a series
of faults that forced large sheets of rock
to pile up.
Click here to watch: San Andreas Fault (3:03)