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Plate Tectonics

yr 10 lesson introduction to plate tectonics

Natasha Georgiou

on 4 November 2013

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Transcript of Plate Tectonics

Our Moving Earth
today we're looking at tectonic plates and how they make up the surface of our earth
- Plates move upon the asthenosphere, the layer of partially molten rock.

- They move because of nuclear reactions in the core that produce heat.

- The heat causes the mantle material to expand and rise toward the surface.

- When it reaches the surface, it cools and moves downward due to gravity.

- This cycle of the
convection currents
and the effect of the gravitational forces cause the plates to move.
The Earth's Plate Movement
so now we know...
the crust of the earth is divided into plates
these plates "float" on the partially melted mantle (asthenosphere)
over a long period of time these plates have moved around the earth creating the land masses we have today
Interactions between plates
There are 3 ways that plates can interact with each other
moving together - converging
moving apart - diverging
and moving past one another - transforming
so now we know...
~ The crust of the earth is divided into plates

~ These plates "float" on the partially melted mantle (asthenosphere)

~ Over a long period of time these plates have moved around
the earth creating the land masses we have today

~ There are 3 ways that plates can interact with each other
moving together - converging
moving apart - diverging
moving past one another - transforming

~ The plates move because of strong convection currents in the mantle
Subduction zones
A subduction zone is a convergent boundary where one edge of a tectonic plate moves under another one. Subduction zones are usually associated with volcanoes and earthquakes.
Transform boundary
The San Andreas Fault is an example of a transform boundary. The eastern plate is moving south and the western plate is moving north.
Google: "plate tectonics evidence fossils" first website result http://www.visionlearning.com/library/module_viewer.php?mid=65
Inside the Earth
Glossary terms: core, mantle, crust
Glossary terms: plate tectonics
You will need scissors and map of the world
Continental Drift Activity
Glossary terms: continental drift, convection currents
Divergent Boundaries

The word diverge is used by scientists to describe what happens when two objects move away from each other. Thus, a divergent boundary is a boundary where two tectonic plates are moving away from one another. This most often takes place at ocean ridges.
Convergent Boundaries

Converge is used to describe two objects that come together. In the case of plate tectonics, the two objects coming together are large plate-like pieces of the Earth’s crust. As these two plates push against each other, one is ultimately forced down beneath the other.

When this happens near land, we see the earth above the two meeting plates rise, forming spectacular mountain ranges. A parallel oceanic trench typically forms just off the shore, as one plate descends deep into the Earth’s core.

These convergent boundaries commonly cause volcanoes to form, as old crust melts. As two plates rub against one another, a number of small and large earthquakes are common near convergent boundaries.
Transform Boundaries

The final type of boundary is one where the two plates slide against each other in a sideways motion. These boundaries between plates is referred to as transform boundaries. As two plates slide past one another, in a transform boundary, neither plate is added to at the boundary, nor destroyed.

The result of two massive plates pushing against one another is that massive amounts of energy build up. Occasionally this energy is released suddenly in the form of large earthquakes.
You will now work in groups to do a mapping activity focusing on spacial association.

Glossary terms:
Spacial association
- the degree to which 2 phenomena have similar distribution patterns (e.g., tall buildings tend to be in cities and large towns)

Spacial interaction
- the degree to which 2 phenomena interact with each other (e.g. if a volcano erupts in an area where there are buildings, spacial interactions can take place
Mapping Activity
Full transcript