1. Features on Earth’s Surface
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Features on Earth’s Surface

2. Watch Constructive Forces earthquakes crustal deformations
volcanic eruptions
sediment depostion
Watch

3. Destructive Forces Wear down landforms
carry bits and pieces of land to other places like the sea
weathering
erosion

4. Divergent Plate boundaries
Make new crusts
two plates moving apart in opposite directions

5. Seafloor Spreading
the seafloor actually spreads apart where the plates pull away
the lava reaches earths surface then solidifies
this makes new ocean crust
The new crust forms a mid ocean ridge

6. Lava cooling under ocean

7. Convergent Plate Boundaries
Destroy crust!
Plates converge or push into each other
deep ocean trenches
continental mountain chains
volcanic island chains

8. Continental Mtn. Range

9. Transform Fault Boundaries
two plates grind past each other
San Andreas Fault

10. Thrust Fault
forms when compression makes a fracture form through the rock layers

11. The force actually pushed one set of rock layers up and on top of the nearby rock layers

12. Fold forms when rock layers bend without breaking
the rocks actually act like silly putty in slow motion

13. Hot Spots
Rock will continually rise through the mantle and melt through the plate
As the magma rises through the crust it actually makes new rock

14. Hawaiian Island in Pacific Ocean

15. Formation of island chains…

16. Shield Volcanoes Largest volcanoes
formed by multiple erosions of highly viscous lava
Ex- Hawaii Islands (Kilauea)
Lava is thin, so gas escapes and doesn’t give pressure a chance to build up

17. Composite the type your picture when someone says volcano
HUGE symmetrical mountains
form along plate boundaries
Mt. St. Helens

18. Cinder Cones spit out ash, gas, and hot rocks like walnuts
only active a few years
small and mound shaped
Paricutin Mexico
actually destroyed SanJaun

19. Glaciers One of the most powerful forces on Earth
Large bodies of freshwater and ice that move down valleys and across land

20. Moraines
glaciers leave deposits of rocks and soil