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What to do…
■ Answer the following questions in your journal
1. Which of the following lists the Earth’s layers in order from hottest to coldest
in temperature?
a. Outer core, mantle, inner core, crust
b. Crust, mantle, outer core, inner core
c. Inner core, outer core, mantle, crust
d. Mantle, crust, inner core, outer core
2. Which of the following components would you least likely to find in the Earth’s
mantle?
a. Iron
b. Aluminum
c. Nickel
d. Silicon
3. Which of Earth’s layers is the thinnest?
a. Crust
b. Mantle
c. Inner core
d. Outer core
Answers:
1. Which of the following lists the Earth’s layers in order from hottest to coldest
in temperature?
a. Outer core, mantle, inner core, crust
b. Crust, mantle, outer core, inner core
c. Inner core, outer core, mantle, crust
d. Mantle, crust, inner core, outer core
2. Which of the following components would you least likely to find in the Earth’s
mantle?
a. Iron
b. Aluminum
c. Nickel
d. Silicon
3. Which of Earth’s layers is the thinnest?
a. Crust
b. Mantle
c. Inner core
d. Outer core
Restless
Continents
State Standard: 7.6 – Describe the relationship
between plate movements and earthquakes,
mountain building, volcanoes, and sea floor
spreading
Think about it?
• Alfred Wegener hypothesized that
all of the continents were once one
large landmass (Pangaea) that
has broken up and drifted apart.
Evidence
• Continents fit like pieces of a puzzle
• Fossils of same species of animal & plants
found on separate continents
• Matching mountain chains
• Coal fields in Antarctica
• Rock formations
• Climatic
conditions
• Pangaea
– Greek for “ all Earth”
• Pangaea broke into two huge continents
– Laurasia
– Gondwana
• These two split again to form the current
continents
Mid-Ocean Ridges and Sea
Floor Spreading
• Mid-ocean Ridges
– Underwater mountain chain that runs
through the Earth’s oceans.
• Sea-floor spreading
– Process in which new lithosphere forms
• Magma rises to the surface through
the mid-ocean ridge forming new
oceanic crust
• Tectonic plates spread apart and
magma fills the gap.
• As new crust forms older crust
moves away from the M.O.R.
• Earth’s north and south poles have changed
places many times
• Molten rock contains contains tiny grains of
magnetic minerals
• These minerals align with the magnetic field of
the Earth.
• As the magnetic field reverses and the ocean
and new ocean floor is formed it leaves a record
of this change.
Sea Floor Spreading
Put it together!
■ Begin working on your study guide.
■ Study guides due on Thursday!