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The earth’s crust
• A. Is one continuous layer of rock with no breaks
• B. Can be classified into two types (continental & oceanic)
• C. Is split into smaller pieces called plates
• D. Both B and C
The earth’s crust
• A. Is one continuous rock
• B. Can be classified into two types (continental & oceanic)
• C. Is split into smaller pieces called plates
• D. Both B and C
The Earth’s plates
• A. Move quickly around the surface of the earth
• B. Sometimes run into each other
• C. Never move
• D. Never touch
The Earth’s plates
• A. Move quickly around the surface of the earth
• B. Sometimes run into each other
• C. Never move
• D. Never touch
Why do plates move?
• A. Magma circulating in the mantle moves them around
• B. Explosions from undersea volcanoes propel the plates apart
• C. The plates repel and attract each other because they are magnetic
Why do plates move?
• A. Magma circulating in the mantle moves them around
• B. Explosions from undersea volcanoes propel the plates apart
• C. The plates repel and attract each other because they are magnetic
What type of plate boundary is this?
• A. Convergent Plate Boundary
• B. Divergent Plate Boundary
• C. Transform Plate Boundary
• D. Bivergent Plate Boundary
What type of plate boundary is this?
• A. Convergent Plate Boundary
• B. Divergent Plate Boundary
• C. Transform Plate Boundary
• D. Bivergent Plate Boundary
What happens at a divergent boundary?
• A. Two plates move together
• B. Two plates move past each other
• C. Two plates move apart
• D. nothing
What happens at a divergent boundary?
• A. Two plates move together
• B. Two plates move past each other
• C. Two plates move apart
• D. nothing
Divergent Plate Boundary
• Starts on land as a rift valley
• Ends up as a mid-ocean ridge (after millions of years)
Divergent Boundaries
• Locations:• Mid-Atlantic Ridge (Middle of Atlantic Ocean)• East African Rift Zone
What type of plate boundary is this?
• A. Convergent Plate Boundary
• B. Divergent Plate Boundary
• C. Transform Plate Boundary
• D. Bivergent Plate Boundary
What type of plate boundary is this?
• A. Convergent Plate Boundary
• B. Divergent Plate Boundary
• C. Transform Plate Boundary
• D. Bivergent Plate Boundary
What happens at a convergent boundary?
• A. Two plates move together
• B. Two plates move past each other
• C. Two plates move apart
• D. nothing
What happens at a convergent boundary?
• A. Two plates move together
• B. Two plates move past each other
• C. Two plates move apart
• D. nothing
Converging Oceanic/Continental
• An oceanic plate and a continental plate meet
• The denser oceanic plate sinks underneath the continental plate
• Called subduction
• Produces volcanoes on the continental plate
Converging Oceanic/Continental
• Locations– Washington and Oregon (Cascade Mountains)– Andes Mountains (South America)
Converging Oceanic/Oceanic
• Two oceanic plates meet
• The oceanic plate with older crust is colder so it is – A. Less Dense– B. Denser– C. Thicker– D. Hotter
Converging Oceanic/Oceanic
• Two oceanic plates meet
• The oceanic plate with older crust is colder so it is – A. Less Dense– B. Denser– C. Thicker– D. hotter
Converging Oceanic/Oceanic
• It subducts underneath the less dense plate
• Volcanoes form on the upper plate
Converging Continent/Continent
• Two continental plates with the same density meet
• True or False: – Subduction can occur?
• FALSE!
– Volcanoes can form?• FALSE!
– Mountains form?• TRUE!
What type of plate boundary is this?
• A. Convergent Plate Boundary
• B. Divergent Plate Boundary
• C. Transform Plate Boundary
• D. Bivergent Plate Boundary
What type of plate boundary is this?
• A. Convergent Plate Boundary
• B. Divergent Plate Boundary
• C. Transform Plate Boundary
• D. Bivergent Plate Boundary
What happens at a TRANSFORM boundary?
• A. Two plates move together
• B. Two plates move past each other
• C. Two plates move apart
• D. nothing
What happens at a TRANSFORM boundary?
• A. Two plates move together
• B. Two plates move past each other
• C. Two plates move apart
• D. nothing
Hot Spots
• Occur in the middle of plates (not a plate boundary)
• Very hot area of mantle (Mantle plume) melts through the crust
• Stationary (never move)
• As plate moves, mantle plume will melt several holes in the crust, forming a chain of volcanoes
Hot Spots
• Which of these chains of volcanoes is caused by a hot spot?– A. Japan– B. Hawaii– C. The Andes in South America– D. The Cascades in North America
Hot Spots
• Which of these chains of volcanoes is caused by a hot spot?– A. Japan– B. Hawaii– C. The Andes in South America– D. The Cascades in North America
• The rest are convergent boundaries