2. Learning
Competency
Describe and
relate the
distribution of
active volcanoes,
earthquake
epicenters, and
major mountain
belts to Plate
Tectonic Theory
Content
standard
The relationship
among the
locations of
volcanoes,
earthquake
epicenters, and
mountain
ranges.
Performance
standard
1. Demonstrate ways to
ensure disaster
preparedness during
earthquakes, tsunamis,
and volcanic eruptions.
2. Suggest ways by
which he/she can
contribute to
government efforts in
reducing damage due
to earthquakes,
tsunamis, and volcanic
eruptions.
3.
4. PLATE TECTONICS
It is a scientific theory describing
the large-scale motion of seven
large plates and the movements
of a larger number of smaller
plates of the Earth's lithosphere,
since tectonic processes began on
Earth between 3.3 and 3.5 billion
years ago.
5. PLATE TECTONICS Alfred Wegener was born in
Berlin in 1880, where his father
was a minister who ran an
orphanage. From an early age he
took an interest in Greenland, and
always walked, skated, and hiked
as though training for an
expedition. He studied in
Germany and Austria, receiving
his PhD in astronomy.
11. 1. Hot mantle from the two adjacent cells rises at
the ridge axis, creating new ocean crust.
2. The top limb of the convection cell moves
horizontally away from the ridge crest, as does
the new seafloor.
4. The material sinks to the core and moves
horizontally.
3. The outer limbs of the convection cells plunge down
into the deeper mantle, dragging oceanic crust as well.
This takes place at the deep-sea trenches.
5. The material heats up and reaches the zone
where it rises again.
13. WHAT IS A
PLATE
BOUNDARIES?
are the edges where two
plates meet. Most geologic
activities, including
volcanoes, earthquakes, and
mountain building, take
place at plate boundaries.
Alfred Wegener proposed that the continents were not stationary, but actually moving or drifting away from one another. His primary sources of evidence included: (UP)Plate tectonic theory became an accepted ideas in the 1970s due to magnetic shifts, convection currents, and sea floor spreading
The top limb of the convection cell moves horizontally away from the ridge crest, as does the new seafloor.
The outer limbs of the convection cells plunge down into the deeper mantle, dragging oceanic crust as well. This takes place at the deep-sea trenches.
The material sinks to the core and moves horizontally.
The material heats up and reaches the zone where it rises again.