Download PART 1 - earth science!

• PART 1: The Theory of Continental Drift is a
hypothesis that states the continents once
formed a large, single landmass called
Pangaea.
http://vimeo.com/14258924
Evidence for Wegener’s theory includes a
puzzle – like fit of the continents,
identical rock types, identical fossils, and
very similar mountain ranges found on
different continents that are separated by
a wide ocean.
Alfred Wegener
•
https://www.youtube.com/watch?v=T1-cES1Ekto&list=RD02T1-cES1Ekto&safe=active
Part 2:
1. Scientists today use sonar to study the ocean
floor. Studying the ocean floor helps scientists
better understand what is happening to our
Earth.
Scientists discovered the ocean floor’s topography is
not flat like they once believed.
2. The continental shelf is the section of the
continental crust that extends under the water.
3. The continental slope is the steep incline section
of the continental crust. It connects the
continental shelf to the abyssal plain.
4. The abyssal plain is a large, flat, almost level of
the ocean floor covered with thick sediment.
5. The mid-ocean ridge is a long, underwater mountain
chain that forms on the floor of the ocean.
6. The rift valley is a long, narrow crack
in the ocean floor in the
middle of the mid-ocean ridge.
Mountains and valleys
The rift is in the valley of the midocean ridge (the mountains)
7. Seamounts are individual mountains of volcanic
material.
8. Ocean trenches are deep valleys or canyons in the
deep ocean floor.
You try it:
1
5
3
4
2
6
Continental Shelf
Seamount
Abyssal
Plain
Mid-Ocean
Ridge
Continental Slope
Rift
Valley
Deep-sea
Trench
Sea Floor Spreading
•
https://www.youtube.com/watch?v=GyMLlLxbfa4&safe=active
1. Sea-floor spreading is the process by which new
oceanic crust forms as magma rises through the rift in
the mid ocean ridge and solidifies (hardens) making new
crust. This new crust pushes the older, colder, denser
crust away from the ridge. This movement of the crust
away from the ridge moves the continents with it.
Flash Presentation
2. The subduction zone is the area
below the trench that pulls the cooler,
old, and more dense crust into the
mantle. The process of crust being
pulled into the mantle is called
subduction.
http://www.youtube.com/watch?v=w
kc4lbhhSRs
So, the process of sea floor
spreading creates new crust, but the
process of subduction destroys the
older crust. Therefore the overall
size of the crust does not change.
Continental Drift/seafloor
spreading song!
http://www.youtube.com/watch?
v=Saxh_mGHt1I&list=UUJjstNDk
wktHyvUdtcBfb2g&index=3
Part 4: 1. The lithosphere is the solid, outermost rigid
layer of the earth. It is made of the crust and the upper
part of the mantle.
Tectonic Plates: large, solid pieces of
Earth’s surface.
2. The asthenosphere is the soft
plastic layer of the mantle that
flows very slowly.
3. Pieces of the “cracked”
lithosphere (tectonic plates) float on
top of the asthenosphere. As they
float, they are in constant slow motion
due to convection currents in the
mantle. The moving of tectonic plates
on the asthenosphere is the theory
of plate tectonics.
4. Where these plates meet ,events such as
earthquakes and volcanoes occur. The place
where plates meet is known as a plate
boundary.
mantle convection cells and
continental drift.wmv - YouTube
Notice convection currents in the mantle.
Part 5:
Convergent Boundary
Divergent Boundary
Transform Boundary
Diagram
Diagram
Diagram
When two tectonic
When two tectonic
When two tectonic
plates move toward
plates move or pull
plates slide or slip
each other
away from each other
past each other
1. A fault is a crack in the earth's crust resulting from the displacement of the
earth’s crust.
PART 6:
1. Geothermal energy is energy released by heat within the Earth.
2. Energy transferred as electromagnetic waves is called radiation.
3. A renewable resource is a resource that can be replaced at the
same rate it is used.