Answer the questions below.
Map of age of ocean floor and explanation.
Researchers today published the most detailed map of the ocean floor ever produced.
Consider how the age of rocks is related to the shape of the seafloor you saw in step 3.
Rather than height of the ocean floor above a base or reference level the depth of the ocean is of interest.
Examine the color code to understand how the age of rocks changes from the center to the edges of the ocean floor.
Data collected by satellites and remote sensing instruments were used to created a model at least twice as.
For that geologists date and study continental crust.
The data is from four companion digital models of the age age uncertainty spreading rates and spreading asymmetries of the world s ocean basins.
To get the dependence on x one must substitute t x v ax l where l is the distance between the ridge to the continental shelf roughly half the ocean width and a is the ocean basin age.
Sio reference series 93 30 scripps institution of oceanography.
Shortly after the conclusion of world war ii sonar equipped vessels crisscrossed the oceans collecting ocean depth profiles of the seafloor beneath them.
They noticed first that these ridges stretched on for thousands of kilometers in long continuous mountain chains that wound around the earth s surface almost.
Contours of 20 million years are available as a layer that is currently set to invisible.
Because of this correlation between age and subduction potential very little ocean floor is older than 125 million years and almost none of it is older than 200 million years.
In the 1950s and 1960s marine geologists such as bruce heezen marie tharp and henry menard used data from echo sounders to map ocean ridges in the north atlantic and the pacific.
The magnetism of mid ocean ridges helped scientists first identify the process of seafloor spreading in the early 20th century.
This dataset shows the age of the ocean floor along with the labeled tectonic plates and boundaries.
The survey data was used to create three dimensional relief maps of the ocean floor and by 1953 american oceanic cartographer marie tharp had created the first of several maps that revealed the presence of an underwater mountain range.
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 data are described in a data and analysis note in the journal of geophysical research 1997 entitled digital isochrons of the world s ocean floor.
The following features are shown at example depths to scale though each feature has a considerable range at which it may occur.
A digital age map of the ocean floor.