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Plate Boundaries
Plate Tectonics
Homeroom Bell Work: September 2
• Write a letter to yourself that focuses on the following questions:
• What are things you like about yourself that does not relate to your
appearance?
• What is something you are proud of?
• What is something that you have recently accomplished?
• What positive and negative life experiences have influenced your self
esteem?
Bell Work: September 2
Now that you understand how the mantle moves, predict how
movement of the mantle could affect what happens on the surface
of the earth?
Give 3 explanations of events that could occur as a result of this
movement.
Sea-Floor Spreading
• Mid-Ocean Ridge-underwater mountain chain where new
ocean floor is produced.
• Sea-Floor Spreading-the sea floor spreads apart along both
sides of a mid-ocean ridge and new crust is added.
• The ocean floor moves like a conveyor belt.
• Molten Rock erupts through the ridges and cools to form
new ocean floors.
Subduction at Trenches
• Deep-ocean trenches-under water canyons
• Eventually the ocean floor plunges into the trenches.
• At these trenches, the oceanic crust bends downward.
(Oceanic Crust is more dense than continental crust)
• Subduction-the process by which ocean floor sinks
beneath a deep-ocean trench and back in the mantle.
• Gravity pulls the older, denser oceanic crust down beneath
the trench.
Earth’s Lithospheric Plates
• The lithosphere is broken into separate sections called plates.
• A scientific theory-a well-tested concept that explains a wide range of
observations.
• The theory of plate tectonics involves the movement of the plates
caused by convection currents.
• The Theory of Plate Tectonics: Pieces of the Earth’s lithosphere are in
slow constant motion driven by convection currents in the mantle
Map Plate Boundaries
• Use the map to highlight the different plates.
• Label the Major Plates
Homeroom Bell Work: September 3
Integrity in the Little Things
Astronauts aboard a trip of space shuttle Columbia were unable to make two scheduled space walks. The
problem…a half-inch screw had fallen from its hole and lodged in the gears of the hatch. So a small, half-inch
screw foiled an important segment of an expensive mission.
In the same way, seemingly small choices can ruin a person's life. It's often a lack of integrity in the small
things, like copying a friend's homework or failing to keep a promise to a little sister, that cause major
problems down the road.
Have you made a promise that you haven't come through on? Do you tell "little white lies"? Do you cheat
"just a little bit, but not nearly as much as others."
Sometimes I think it's those "little things" that show our true character. This week, let's each take one of
those "little areas," quit rationalizing about it and try to deal with it. It may turn out to be the best thing you
ever did.
Discussion Questions: (In your groups of 4)
1) How did a 1/2 inch screw keep a space shuttle from accomplishing its mission?
2) What are some ways people try to justify their "small" character flaws?
3) What are some integrity issues that students tend to consider "not that bad."
4) Think of something you tend to do that you know is wrong, but you tend to justify or discount as "not
all that bad." Could you work on that area this week?