Plate Boundaries
SCIENCE IDEAS:
Convection Current - created by the uneven heating of
fluid liquid or gas, which creates the current.
Trench - long, anrrow depressions on the seafloor that
form at the boundary of tectonic plates whre one plate is
pushed, or subducts, beneath another.
Fault Line - a place where there is a long break in the
rock that forms the surface of the earth and where
earthquakes are more likely to happen.
PLATE TECTONIC
the lithosphere of the earth is divided into a small
number of moving plates whose movements cause
seismic activity (as earthquakes)
The movement of these tectonic plates is
likely caused by convection currents in the
molten rock in Earth's mantle below the
crust. Earthquakes and volcanoes are the
short-term results of this tectonic
movement. The long-term result of plate
tectonics is the movement of entire
continents over millions of years
What are the seven continents of the
world?
• A continent is one of
Earth's seven main
divisions of land. The
continents are, from
largest to smallest: Asia,
Africa, North
America, South
America,
Antarctica,
Europe, and
What do you think is the basis of scientist in dividing Earth’s lithosphere into several plates?
• the distribution of earthquake
epicenters, location of volcanoes,
and formation of mountain
ranges. All of this geological
features that are formed because
of plate movement.
Study the pictures.
1. What is unusual in Picture A? in Picture B?
2. What particular calamity took place in the area?
3. Why do earthquakes occur?
4. Do you think our locality is exempted to
earthquakes occurrence? Why do you say so?
5. What are the first thing we should do when
earthquake occurs?
DIVERGENT PLATE BOUNDARY
How does divergent plate boundary occur?
• - when two plates move away from each other.
• - wherein plates move apart creating a zone of
tension represented by the directions of the
arrows.
New crust is formed as molten rock from the
mantle erupts along theopening. Divergent plate
motion created the Great Rift Valley in Africa, the
Red Sea, and the Gulf of Aden.
conVERGENT PLATE BOUNDARY
- the plates are moving
towards each other. This is
an example of a zone where
plates collide.
What do you think will be formed when two plates
collide?
-Formation of huge, high
mountain
There are two forms
of convergent
boundaries,
we have the
subduction and
How does subduction occur?
When a continental plate collides
with an oceanic plate, the oceanic
plate dips beneath the thicker,
more rigid continental plate
because it is thinner, denser, and
more flexible.
The arrow heading
upward and arrow
heading downward.
The arrow that points
upward is the continental
plate while the arrow
pointing downward is the
oceanic plate.
When subduction convergent plate boundaries
happened, what does it forms?
Deep ocean trenches form as a result of
subduction, such as the one off the west coast of
South America. The continent's dragged-down
rocks begin to dissolve. Sometimes molten rock
comes to the surface and forms a line of
volcanoes throughout the continent.
Collision
-two continental
plate meet head on.
When two continental plates collide, what does it
form?
Both plates collapse and are pushed up since
neither is stronger than the other. As a result,
massive, high mountain ranges, such as the
Himalayas, can emerge.
transform PLATE BOUNDARY
When two tectonic plates slide past
each other, the place where they
meet is a transform or lateral fault.
How does Transform plate boundary occur?
Transform fault boundary occurs
when plates slide or grind past
each other without diverging or
converging.
And what does forms?
The San Andreas Fault
is one of the best
examples of lateral
plate motion
The San Andreas fault
is bounded by the
North American
plate and the Pacific
plate.
TRUE/FALSE. Read each statement
carefully. Write FACT if the statement is
TRUE and write the BLUFF if the
statement is FALSE.
1. San Andreas fault
was formed due to the
collision of two
continental plates.
2. When a continental plate
collides with an oceanic
plate, the oceanic plate
sinks beneath the
continental plate
3. Divergent occurs
when plates move
towards each other
and collide.
4. When two
continental plates
collide deep ocean
trenches formed.
5. Formation of huge,
high mountain ranges
such as the Himalayas
are caused by
subduction
Activity #3
Find your partner.
Bring the following:
Bond Paper
Scissors
Coloring pens/ crayons
Glue
