The Changing World

Where will we be in 2000 more years?By Sammie Miller

PANGAEAOriginally thought of

by Alfred WegenerA giant super-

continent that was made up of tectonic plates

The plates moved to form the continents we know of today

Theory not immediately accepted by scientists (didn’t explain WHY the continents move)

Existed during the Carboniferous period

PANGAEA- all lands

Alfred WegenerLived from 1880-1930Also studied astronomy,

as well as geologybrought him to the

discovery of the changing universe, so the world is changing

When Alfred discovered Pangaea, the Contradiction Theory was being argued about

Contradiction Theory- theory about the beginning of the Earth.

Arthur Holmes, Harry Hess, R. Deitz helped in discovery; proved that the mantle basically moved the plates

How did Pangaea Change?!?!

The plates and boundaries move, and in different ways!

Convergent BoundaryHappens when 2 tectonic

plates push into each other

One is forced under the other and becomes part of the mantle

Causes island arc systems, trenches, mountains, and volcanoes

When parts of the mountains and volcanoes break off, they cause landslides and mudslides

Example: The Aleutian Islands and Trench (North American and Pacific plate push into each other)

Divergent BoundaryHappens when two

plates pull apart from each other

Magma seeps through and cools

Causes the growth of oceanic crust and ridge systems.

The ocean floor is spreading in result

Example: North American and Eurasian Plate pulling apart from each other; the continents are getting farther and farther apart

Transform BoundaryHappens when two

plates slide past each other

Only Boundary that doesn’t destroy or add to the plates

Causes Earthquakes and Faults

Earthquakes relieve strain between the plates

Example: San Andreas Fault; the North American and Pacific plate slide past each other- lots of earthquakes in the area

What about the future?!?!

Ohio and the U.S.On the North

American PlateBordered by the

Pacific, Juan De Fuca, Cocos, and Caribbean Plate

Ohio- recently been mini earthquakes

Believed we live on a weak part of the plate

Other susceptible hazards in the U.S.

Alaska- VolcanoesCascades- VolcanoesSan Andreas

Fault=earthquakesAppalachian Mtns.-

ancient convergent boundary; mountains

Caribbean- Volcanoes

The Very Distant FutureMany years from

now, the world will not look the same as it looks today

The east and west hemisphere will pull away from each other and might meet on the other side

The Atlantic ocean will grow, and the Pacific will shrink

Himalayan Mtns. will probably grow

Sourceshttp://www.ucmp.berkeley.edu/geology/techis

t.htmlhttp://scign.jpl.nasa.gov/learn/plate4.htmhttp://www.dnr.state.oh.us/geosurvey/html/ge

o_f03/tabid/8307/Default.aspxhttp://geology.com/plate-tectonics.shtmlhttp://www.google.com/imghp?hl=en&tab=wi

The End!Watch out for

earthquakes!!!