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.
Sea floor spreading equation w 4 3.
R d t or r 9 5 10 7 cm 6 5 10 7 years 1 46 cm yr.
Spreading ridges trenches transform faults understand and be able to calculate seafloor spreading rate.
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.
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.
Spreading rates determine if the ridge is fast intermediate or slow.
Learn about the 3 major types of plate tectonic boundaries.
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.
This is the continuation of the previous day s lesson link here on sea floor spreading.
Earth s interior systems 5.
On the other hand the newest thinnest crust is located near the center of the mid ocean ridge the actual site of seafloor 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.
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.
Use the above equation to calculate spreading rate.
Spreading rate is the rate at which an ocean basin widens due to seafloor spreading.
Heezen tharp seafloor topography map purchased from osu bookstore for 5 calculator.
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.
What do you imagine is on the bottom of the deep ocean floor.
1cm yr to 10 cm yr.
Seafloor spreading theory that oceanic crust forms along submarine mountain zones and spreads out laterally away from them.
Ranges of spreading throughout the world s oceans.
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.
Radiometric age dating and fossil ages.
