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Hand in both homework assignments to
the bin in front.
Answer these questions in your
notebook:
1.
2.
i.
Who was the first person to propose that
the continents once fit together?
ii. What was one of Wegener’s forms of
evidence for continental drift?
iii. What were the two flaws of Wegener’s
continental drift hypothesis?
Plate Tectonics
What evidence do scientists have to support the fact
that the Earth’s crust is continuously moving?
Plate Tectonics
 The
theory that describes how
tectonic plates move and shape
Earth’s surface
 Tectonic
plates are huge pieces of
crust that fit together at their edges
to cover Earth’s surface.
About 12 plates exist on Earth
Earth’s Interior

Crust – Rigid outer
shell of Earth
◦ Oceanic and
Continental Crust

Mantle
◦ Upper mantle is
partially molten
◦ Lower mantle is
rigid (solid)
Earth’s Interior
Core
 Outer core is molten
iron, source of
Earth’s magnetic field
 Inner core is solid,
Iron and Nickel
Plate Boundaries
Divergent Boundary
Convergent Boundary
Transform Boundary
Divergent Boundary
 Two
tectonic
plates move apart
from each other
 Mid-Ocean Ridges
 Rift valleys – long
narrow
depressions
 Rift valley in East
Africa
Convergent Boundary
 Two
tectonic plates move towards
each other (come together)
 Oceanic
Plates are more dense
 Continental Plates are less dense
Subduction
 Process
when one tectonic plate slips
beneath another plate
Convergent Plate Boundaries

Oceanic – Oceanic
◦ Subduction Occurs
◦ Deep Sea Trenches (Marianas Trench)
Convergent Plate Boundaries

Oceanic –
Continental
◦ Subduction
Occurs
◦ Trench and
Volcanic Arch
(Peru – Chile
Trench)
Convergent Plate Boundaries

Continental –
Continental
◦ No Subduction
Occurs
◦ Mountain
Building
◦ Himalayas
Transform Boundary
 Region
where
two plates slide
past each other
 Earthquakes
occur at
transform
boundaries
 San Andreas Fault
in San Francisco