Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Schiehallion experiment wikipedia , lookup
Physical oceanography wikipedia , lookup
Age of the Earth wikipedia , lookup
Geomagnetic reversal wikipedia , lookup
History of Earth wikipedia , lookup
History of geomagnetism wikipedia , lookup
Large igneous province wikipedia , lookup
Geological history of Earth wikipedia , lookup
Section 11.1 (Part 2, Pages 360-369) 1) One theory about the formation of the continents is that all of the continents were at one time joined together in a huge land mass, called ________________________ (which means ________________________________), and it broke apart about ______________________________ years ago. 2) The theory of ____________________________________________ suggests that the continents change position very slowly, moving over the surface of Earth a few centimetres every year. 3) The biological evidence for continental drift: Some similar ___________________ have been found in areas no longer connected, and some fossils have been found where weather or land conditions are not consistent with what that species would have needed to survive. 4) The geological evidence for continental drift: Some similar _______________ have been found in areas no longer connected. 5) The meteorological evidence for continental drift: ________________________ (which need rich plant life in a tropical, swampy environment to form) have been found in moderate and cold climates. 6) New technology became available to gather evidence from the ____________________________________: -____________________ is a sound wave technology that sends out sound waves and then records the time that the sound waves take to bounce back. It is used to map the _____________________ and ___________________________________________________. Sonar revealed that many features found on the sea floor were ___________________ to features found on land (ex: mountain ridges like the __________________________ that stretches north to south along the middle of the Atlantic Ocean). -_____________________________ are sensitive instruments that can detect the direction and strength or a magnetic field. Testing showed that at some point there was a reversal in Earth’s magnetic field and that the sea floor was ______________________. -____________________________________________ involves core samples being collected by drilling into the oceanic crust. Tests show that younger rock is closer to the MidAtlantic Ridge and older rock is closer to the continents. 7) These new technologies indicated that Earth’s crust is ______________________________. 8) When magma rises from an ocean ridge, the magma produces _______________________, which pushes the plates apart. As these plates are pushed apart, other plates are pushed together. At ____________________ boundaries, plates move away from each other. At ___________________________ boundaries, plates move toward each other. 9) A third concept of movement is that some plates are sliding past each other along a ___________________________ boundary. 10) The continental drift theory was dismissed because the _______________________ was moving too, not just the continents. The new theory is called ____________________________ and it states that the Earth’s crust is broken up into pieces (plates) that are always moving around on Earth’s ____________________. 11) __________________________________ are now used to measure plate movements. 12) Scientists are still not sure what causes the plates to move. One explanation is that ______________________________________ in the mantle move the plates. 13) Each plate touches several other plates, so each movement of one plate affects other plates. When two plates collide or converge, one plate is shoved under the other. The area where one part of the crust is forced below another part is called a ____________________________________________.