Measure from the center of the spreading center to a known age point on the plate rather than from 65 ma on the eastern plate to 65 ma on the western.
Sea floor spreading equation w 4 3.
3 3 g cc and 1580 k exp 1 control 4 3 g cc and 1580 k exp 2 30 increase in mantle density 3 3 g cc and 2050 k exp 3 30 increase in mantle temperature see brief overview of ocean depth sea floor spreading model for a description of the model equation c and how it relates to mantle temperature and density.
Radiometric age dating and fossil ages.
It seems that the different parts of our planet are moving.
Learn about the 3 major types of plate tectonic boundaries.
This is the continuation of the previous day s lesson link here on sea floor spreading.
Sea floor spreading l 1 2 3 introduction you have already learned about continental drift divergent convergent and transform plate boundaries mid ocean ridges subduction and the role that convection currents in the earth s mantle play in causing these phenomena.
Ranges of spreading throughout the world s oceans.
R d t or r 9 5 10 7 cm 6 5 10 7 years 1 46 cm yr.
Seafloor spreading theory that oceanic crust forms along submarine mountain zones and spreads out laterally away from them.
Spreading rates determine if the ridge is fast intermediate or slow.
During this lesson students take additional time to complete the graph that they started on day 1 and then do some post graph analysis before taking an exit ticket daily summative assessment.
Earth s interior systems 5.
Spreading ridges trenches transform faults understand and be able to calculate seafloor spreading rate.
On the other hand the newest thinnest crust is located near the center of the mid ocean ridge the actual site of seafloor spreading.
Use the above equation to calculate spreading rate.
By the use of radiometric age dating and studying fossil ages it was also found out the rocks of the sea floor age is younger than the continental rocks.
The rate at which new oceanic lithosphere is added to each tectonic plate on either side of a mid ocean ridge is the spreading half rate and is equal to half of the spreading rate.
Basalt the once molten rock that makes up most new oceanic crust is a fairly magnetic substance and scientists began using magnetometers to measure the magnetism of the ocean floor in the 1950s what they discovered was that the magnetism of the ocean floor around.
The magnetism of mid ocean ridges helped scientists first identify the process of seafloor spreading in the early 20th century.
This idea played a pivotal role in the development of the theory of plate tectonics which revolutionized geologic thought during the last quarter of the 20th century.
1cm yr to 10 cm yr.
The equation y 7x 3 can be used to represent this situation where y is the depth of the fish in meters below sea level and x is the number of seconds the.
