Plate Tectonics

12

there are _____ major plates of the earth

lithosphere

this is the crust and upper-most solid mantle of the earth

asthenosphere

the lithosphere floats on …

plate tectonics

continental drift and seafloor spreading are evidences for

continental drift, seafloor spreading

2 evidences for plate tectonics

continental drift

this is idea that the lithosphere getting divided into several plate from Pangaea

Africa, South America

the 1st evidence of continental drift is that _______ and _______ fit together 2D and 3D

radioactive dating

the 2nd evidence of continental drift where the ______ of rocks in west africa and northern brazil show the same age

crops and reptiles

the 3rd evidence of continental drift where _____ and ______ were found in Africa, South America and Austrailia

appalachian mountain range

the 4th evidence of continental drift, ________ end is new england and continues in Britain and Scandinavia

southern hemisphere

the 5th evidence of continental drift, the _______ was covered with ice millions of years ago

seafloor spreading

observations of mid-oceanic ridges, ridge crest consisting of basaltic lava and the orientation and intensity of earth’s magnetic field confirm this evidence of plate tectonic

increase

the age of rocks ______ away from the mid-oceanic ridge is an example of evidence of seafloor spreading

away

the thickness of sediments increase ______ from the midoceanic ridge is evidence of seafloor spreading

symmetrical

evidence of seafloor spread includes the earth’s magnetism changes with time, these iron forming minerals are deposited differently with time and are noted to be ________

divergent

constructive plate boundary; ,type of movement at a plate boundary

convergent

destructive plate boundary ; type of movement at a plate boundary

shear

conservative/transform plate boundary ; type of movement at a plate boundary

plate boundaries

earthquakes and volcanoes occur primarily along