Pages 159172 Constructive Forces earthquakes crustal deformations volcanic eruptions sediment depostion Watch Destructive Forces Wear down landforms carry bits and pieces of land to other places like the sea ID: 790380
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Slide1
Features on Earth’s Surface
Pages 159-172
Slide2Constructive Forces
earthquakes
crustal deformations
volcanic eruptionssediment depostion
Watch
Slide3Destructive Forces
Wear down landforms
carry bits and pieces of land to other places like the sea
weatheringerosion
Slide4Divergent Plate boundaries
Make new crusts
two plates moving apart in opposite directions
Slide5Seafloor Spreading
the seafloor actually spreads apart where the plates pull away
the lava reaches earths surface then solidifies
this makes new ocean crustThe new crust forms a mid ocean ridge
Slide6Lava cooling under ocean
Slide7Convergent Plate Boundaries
Destroy crust!
Plates converge or push into each other
deep ocean trenchescontinental mountain chainsvolcanic island chains
Slide8Continental Mtn. Range
Slide9Transform Fault Boundaries
two plates grind past each other
San Andreas Fault
Slide10Thrust Fault
forms when compression makes a fracture form through the rock layers
Slide11The force actually pushed one set of rock layers up and on top of the nearby rock layers
Slide12Fold
forms when rock layers bend without breaking
the rocks actually act like silly putty in slow motion
Slide13Hot 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
Slide14Hawaiian Island in Pacific Ocean
Slide15Formation of island chains…
Slide16Shield 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
Slide17Composite
the type your picture when someone says volcano
HUGE symmetrical mountains
form along plate boundariesMt. St. Helens
Slide18Cinder Cones
spit out ash, gas, and hot rocks like walnuts
only active a few years
small and mound shapedParicutin Mexico actually destroyed SanJaun
Slide19Glaciers
One of the most powerful forces on Earth
Large bodies of freshwater and ice that move down valleys and across land
Slide20Moraines
glaciers leave deposits of rocks and soil