Bell Work: 10/24/13

1
Bell Work 10/24/13
Write the question, full answer, and justify why
you chose your answer. Work on your Earths
Layers Foldable when you are finished with bell
work.
2
Agenda

1. Bell Work
2. Agenda/Objectives
3. Word Wall
4. Think/Pair/Share
5. Movement of Earths Plates
6. Review
7. Earths Layers Plates Checkpoint

3
Objectives

• 25. Movements of Earths Major Plates
• Can I differentiate among the characteristics of
  earths three layers? (SPI 0707.7.4)
• Can I recognize that lithospheric plates on the
  scale of continents and oceans continually move
  at rates of centimeters per year? (SPI 0707.7.5)
• Can I describe the relationship between plate
  movements and earthquakes, mountain building,
  volcanoes, and sea floor spreading? (SPI
  0707.7.6)

4
Word Wall Word of the Day

• genetic produced by genes

5
Think, Pair, Share

• Come up with an explanation to the following
  question, pair up with your elbow partner,
  share
• How do we know so much about the mantle and the
  core?

6
Question

• How do we know so much about the mantle and the
  core?
• We can study magma on the Earths surface from
  volcanic eruptions. Also, seismic waves, or
  vibrations produced from earthquakes, travel at
  different speeds through the Earth. Their speed
  depends on the density and composition of the
  material they pass through.
• Traveling through a solid will go faster than
  through a liquid. How did this knowledge help
  scientists figure out what state each layer is in?

7
Restless Continents

• Look at pg. 400!
• In the early 1900s, ___________ ___________ wrote
  about his hypothesis of ____________ ______,
  arguing that all the continents were once joined
  together in a single landmass and have drifted
  apart.
• He proposed that the continents plowed through
  ocean floor, driven by the spin of the Earth.
• Continental drift is the hypothesis that states
  that the _____________ once formed a single
  ______________, broke up, and drifted to their
  present locations.

Alfred
Wegener
continental
drift
continents
landmass
8
Pangaea

• Wegener thought that all of the present
  continents were once __________ in a single, huge
  continent called ______________.
• Pangaea is Greek for ______________.

joined
Pangaea
all Earth
9
Look at the map. At your group, discuss the
following questions. You have 2 minutes.

• What evidence supports Wegeners theory?
• Since not all dinosaurs could swim, explain how
  the same fossil can be found on all continents.

10
Challenging Question

• Written Reflection
• Based on what you know about the plates, how
  would you prove Wegeners theory to be true today?

11
Tracking Tectonic Plate Motion

• Today, scientists use a system of satellites
  called global positioning system or GPS.
• Radio signals are continuously beamed from
  satellites to GPS ground stations, which record
  the exact distance between the satellites and the
  ground stations.
• Over time, these distances change slightly.
• Key Point The movement is measured in
  centimeters per year.

12
Composition of Earths Plates

• Wegener thought that more than continents were
  moving. According to the theory of _________
  _________, Earths lithosphere is divided into
  tectonic plates that move around on the
  asthenosphere.
• A ___________ is a place where tectonic plates
  touch.
• ____________- boundary formed by the collision of
  two lithospheric plates
• ____________- boundary between two tectonic
  plates that are moving away from each other
• ____________- boundary between tectonic plates
  that are sliding past each other
  horizontally

plate
tectonics
boundary
Convergent
Divergent
Transform
Check this out!
13
Proving Wegener Wrong

• The older term "continental drift" is not quite
  accurate -- both continents and oceanic crust
  move.
• We now know that Wegener's theory was wrong in
  one major point continents do not plow through
  the ocean floor. Instead, both continents and
  ocean floor form solid plates, which "float" on
  the asthenosphere, the underlying rock that is
  under such tremendous heat and pressure that it
  behaves as an extremely viscous liquid.

14
2 Minute Journal

• Write a two minute journal giving evidence on
  how Wegners Continental Drift theory could
  possibly be true, but also discuss the flaws
  behind his theory.

15
Main Idea Events associated with movements of
earths major plates

• Sea-floor spreading
• Mountain building
• Earthquakes
• Volcanoes

16
Self- Reflection

• 5 I could teach this to my parents.
• 4 I understand most of what we learned.
• 3 I still have some questions about __.
• 2 I need help with objective ___.
• 1 Im feeling very confused.
• Can I differentiate among the characteristics of
  earths three layers? (SPI 0707.7.4)
• Can I recognize that lithospheric plates on the
  scale of continents and oceans continually move
  at rates of centimeters per year? (SPI 0707.7.5)
• Can I describe the relationship between plate
  movements and earthquakes, mountain building,
  volcanoes, and sea floor spreading? (SPI
  0707.7.6)