Grade 10 Week 4 quarter 1 types of Plate Boundaries simple PPT

1. TYPES OF PLATE
BOUNDARIES

2. The Earth’s outer surface is
composed of tectonic plates which are
enormous sections of the planet’ crust
that roughly fit together and meet at
the places called plate boundaries.

3. Plate boundaries are the lines at the
edges of the different pieces of the
lithosphere and the lithospheric plates are
moving due to the convection current in
the earth’s interior.

4. There are two types of crust
• Continental Crust is thicker but less dense.
• Oceanic Crust, which is thinner and denser.
• Remember, the earth’s lithosphere moves slowly and
constantly over time, it rides on a warmer, softer layer
of the mantle called the Asthenosphere, this
movement causes the formation of plate boundaries.

5. Types of Plate Boundaries
•Divergent Plate Boundary
•Convergent Plate Boundary
•Transform Plate Boundary

6. Divergent Boundary
The plate moves in 3 basic ways
When we push down the plate and slide them apart the filling may tend to flow
upward (Divergent boundary). It happens when two tectonic plates move away
from each other, and when that occurs magma or molten rocks escape or rise from
the Earth’s mantle to the surface or into the space between the spreading tectonic
plates.
Divergent boundaries can form within continents but will eventually open up
and become ocean basins.
On land, divergent boundaries within continents initially produce rifts which
produce rift valleys.
The most well-known rift valley on Earth is probably the so-called “Great rift
Valley system”

7. Which stretches from the middle east and north Mozambique
to the south. The area is geologically active and features
volcanoes and hot springs and geysers and frequent
earthquakes other than the sea, the most active divergent plate
boundaries are between oceanic plates and are often called the
“Mid Oceanic Ridges”.
One example of the ridge is the mid-Atlantic ridge, an
undersea chain of mountains that formed as two pairs of
tectonic plates spread apart.

9. Convergent Boundary
Slowly push the two pieces toward each other.
What happens to the fillings as the two pieces slide together?
This demonstrates the Convergent boundary.
This happens when two plates are colliding. A collision can take place
between two continental plates, two oceanic plates, or continental or
oceanic plates.
Typically, a convergent plate boundary such as the one between the
Indian plate and the Eurasian plate forms towering mountain ranges like the
Himalaya.

10. As Earth’s crust is crumpled and pushed upward. In some cases, a
convergent plate boundary can result in one tectonic plate diving
underneath another. This process is called subduction which involves an
older, denser tectonic plate being forced deep into the planet, underneath a
younger, less dense tectonic plate.
When this process occurs in the ocean a trench can form. Mariana
Trench is the deepest part of the ocean and the deepest location on earth is
11,034 meters deep.

12. Transform Plate Boundary
Sliding 2 pieces laterally pass one another over the filling.
The plates do not slide smoothly past one another.
Occurs when plates slide past each other. The relative motion of
the plates is horizontal, they can occur underwater or on land and the
crust is neither destroyed nor created. Because of friction, the plates
cannot simply glide past each other, rather stress builds up in both
plates, and when it exceeds the threshold of the rocks the energy is
released causing earthquakes.
A well-known transform plate boundary is the San Andreas fault
which is responsible for many of California’s earthquakes.