in the convection currents in a lava lamp, the cooler, more dense goo __. a. rises to the top b....
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In the convection currents in a lava lamp, the cooler, more dense
goo __.
a. rises to the topb. sinks to the bottomc. stays where it isd. goes in circles
CRCT Question
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Corny Joke of the Day
Why didn’t the mummy have any
friends?
He was too wrapped up in
himself
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Monday: Finish Continental Drift Notes Tuesday: Gallery walk, Tier 2 CD Worktime Wednesday: Tier 2 CD worktime-DUE AT THE END OF CLASS Thursday: STUDY GUIDE DUE, Review activities Friday: Vocabulary Sheet DUE. TEST
Week at a Glance
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Tier 2 Rubric Vocabulary: (10 pts each)
1. Alfred Wegener2. Pangaea3. Harry Hess4. Sea-floor Spreading5. Magnetic Pole Reversale 6. Glossopteris 7. Fossil Evidence 8. Geological Evidence9. Climate Evidence10 pts. Organization/Presentation
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Vocabulary Sheet
Complete 1-4
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1. density
Density = Mass/Volume. The amount of mass in a given space.
Cold material=more dense=sinkHot Material=less dense=rises
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2. continental crust
section of earth's crust that is foundunderneath the continent. Layer that
we live on!
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3. oceanic crust
section of earth's crust that is foundunderneath the ocean. Thinnest
Layer. More DENSE then continental
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4. mantle
the layer of hot, solid, molten material between Earth's crust and core. Thickest Layer. Contains the convection currents
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What does this represent?
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Welcome to Ms. Evans Cheer Camp
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When I say transform you
say
Slide
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Transform
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Transform
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When I say Divergent you
say
Apart
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Divergent
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Divergent
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When I say convergent you
say
Collide
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Convergent
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Convergent
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II. Sea-Floor Spreading
http://www.youtube.com/watch?v=GyMLlLxbfa4&feature=related
While you watch….look forHarry Hess
How did they find the mountain ranges?
Let’s watch it in action!
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A. The Mid-Ocean
Ridge is the longest chain of mountains in the
world and are located on the
ocean floor.
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: www.ocean.udel.edu
The Mid-Ocean Ridge system, shown above snaking its way between the
continents, is more than 56,000 kilometers (35,000 mi) long. It circles the earth like
the stitching on a baseball!
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This is a model of sea floor spreading at a divergent boundary called a mid ocean
ridge.
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B. Sonar is a device that bounces sound
waves off underwater objects and then
records the echoes of these sound waves. Scientists use sonar to study the ocean
floor.
SONAR
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Discovery of Sea-Floor Spreading
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C. Evidence for Sea-Floor Spreading 1. The mid-ocean ridge forms along cracks
in the oceanic crust2. At the mid-ocean ridge, molten material
rises from the mantle and erupts. The molten material then spreads out, pushing older rock to both sides of the ridge
3. Sea floor spreading is the process by which new material is continually added to the ocean floor.
4. Several types of evidence is used to support sea-floor spreading – magnetic stripes, molten material, and drilling samples
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Sea-Floor Spreading
m.y. means million years ago
Notice this compass.
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Animation of sea floor spreading
Can you explain this diagram!?
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As the sea floor spreads, the lava cools according to the magnetic poles at the
time. The rocks on the ocean floor have proved that the earth’s magnetic field
sometimes reverses. The inner core flips and so the north pole moves to the
southern hemisphere! The earth itself does not flip.
http://platetectonics.pwnet.org/img/blocks.gif
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So, if the mid-Atlantic Ridge is getting new
crust….is the Earth getting bigger?
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D. Subduction at Deep-Ocean Trenches1. Deep ocean trenches are where the
ocean floor plunges into deep underwater canyons. They are formed where the oceanic crust bends toward the mantle.
2. Subduction – process by which the ocean floor sinks beneath a deep ocean trench and back into the mantle
3. At deep ocean trenches, subduction allows part of the ocean floor to sink back into the mantle, over tens of millions of years.
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The PACIFIC ocean is where
most of the crust is getting
subducted back into the Earth. Here, there are lot of volcanoes
and earthquakes. It’s known as the
Ring of Fire!
Extra Info
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Plate Tectonics vs. Continental Drift
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Please, show me the rough
draft before you
start typing!!!!
Tier work time