Download presentation
Presentation is loading. Please wait.
Published byAnn Fleming Modified over 8 years ago
1
Plate Boundaries
2
Earth’s outer layer is divided into many strong, moving lithospheric plates lithospheric Tectonic Plates Plate Tectonics
3
Lithosphere = Crust + rigid upper mantle Asthenosphere = a weaker mantle layer beneath the lithosphere Asthenosphere Tectonic Plates
4
Subduction Subduction – when one plate slides underneath another, forms trench Ocean crust (basalt) is more dense/heavier than continental crust (granite) Ocean crust subducts beneath continental crust and ocean crust
5
Mantle convection slab-pull & ridge-push Why Do the Plates Move? Internal Heat & Gravity
6
Convergent Plate Boundaries Plates collide
7
Continent-Continent Shallow earthquakes No volcanoes Large mountain ranges Convergent Plate Boundaries
8
Continent-Continent Himalayas
9
Ocean-Continent Shallow to deep earthquakes Convergent Plate Boundaries Plate Tectonics Rising magma forms a continental volcanic arcvolcanic arc Trench forms Subduction takes place
10
Convergent Plate Boundaries Plate Tectonics Ocean-Continent Andes Cascades
11
Ocean-Ocean Shallow to deep earthquakes (subduction zone)subduction zone Rising magma produces an island arc. Convergent Plate Boundaries Plate Tectonics Trench forms from subduction
12
Convergent Plate Boundaries Plate Tectonics Ocean-Ocean Japan Aleutians
13
Divergent Plate Boundaries Plate Tectonics Plates move apart
14
Divergent Plate Boundaries Plate Tectonics Mid-Ocean Ridge Mid-Atlantic Ridge Shallow earthquakes, volcanism Mid-ocean ridges with rift valleys
15
Divergent Plate Boundaries Plate Tectonics Continental Rift East Africa Rift Shallow earthquakes Volcanic activity may occur Rifting apart of continental crust Rifting valley forms
16
Transform Plate Boundaries Plate Tectonics No volcanism Plates slide by each other Shallow earthquakes San Andreas Fault
Similar presentations
© 2024 SlidePlayer.com. Inc.
All rights reserved.