Transcript Plate Tectonics

 The focus question for this chapter of the book was
How does population density affect the way
people live?
 I’d like you to answer this question giving
4
examples from yesterday’s activity to support
your answer.
 Think back to our examples from transportation,
housing, land use and health care
 You can just use bullet points
Or, When Good Planets Go Bad
 Plate tectonics=The Earth's surface is made up of moving plates
 According to this theory, the Earth's crust…..
 is made up of about a dozen plates, some are little and others
take up 25% of the Earth’s surface
 is continually shifting because the surface beneath them - the
hot, soft mantle - is moving slowly like a conveyor belt, driven
by heat and other forces at work in the Earth's core
 is moving about a centimeter (0.5 in) to 15 centimeters (6 in)
per year in different directions
 Scientists believe that 200
million years ago there was
one big megacontinent
(Pangaea)
 This broke up about 100
million years ago and made 2
continents (Gondwanaland
and Laurasia) that were
surrounded by the
Panthalassa Ocean
 The plate interact with each other
in 3 different ways
 Divergent
 Convergent
 Transform
 This is where new crust to the
Earth is formed with the plates
split away from each other
 This takes place underneath the
ocean floor (called the Mid
Atlantic Ridge)
 You can see the Mid Atlantic Ridge
in Iceland…that’s where it pops up
to the surface!
 This is where plates are
destroyed when one plate dives
under another
 Ocean plates sink down under
continental ones because they are
heavier
 An example of this is the plate
boundary by Japan
 Any place on a planet where material
from the inside of the planet makes its
way through to the surface
 The material the definition is referring
to is magma (fluid molten rock), which
is
 partially liquid, partially solid and
partially gaseous
 Tsunamis can happen when
underwater earthquakes
happen
 They happen at convergent
boundaries, where ocean
plates sink under land plates
 When the plates underwater
move, the water mirrors the
change
 http://science.howstuffwork
s.com/tsunami3.htm
 Here’s a
video of
what
happened in
Japan in
March 2011
 Answer the questions on your worksheet using the
website I’m about to project on the screen.
 Connect the dots between Japan’s population, Japan’s
landforms and the tsunami damage, both to people
and to buildings….
 When two continental
plates collide at a
convergent boundary,
they both weigh the
same
 They crash into each
other and create
mountains
 This is how the
Himalayas (29,000 feet
tall) got here
 This is where the
plates don’t get
destroyed….they just
slide next to each
other
 There are two ways you
can apply plate tectonics
to this clip from Finding
Nemo….can you figure
them out?