Plz answer these questuin and mark on the diagram attact to it Magnetic reversals are found worldwide, so magnetic anomaly stripes should be the same width in every ocean if the rate of seafloor spreading were the same at all mid-ocean ridges. If a particular anomaly stripe is wider in one ocean than in another, however, the difference must result from faster spreading. The figure on the right shows simplified magnetic anomaly stripes from the South Atlantic and South Pacific oceans, the ages of the rocks in the stripes, and their distance from the spreading center (the red line). For simplicity, only the most recent 80 million years of data are shown for the two oceans, and we will estimate the spreading rate only for that time span. (a) Provide the width of the South Atlantic Ocean, as given in the nearer figure on the right. km (b) Estimate the average rate at which the South Atlantic Ocean has been opening over the 80 million years for which data are provided. cm/yr km per million years (c) Now look at the data for the South Pacific Ocean and its spreading center, the East Pacific Rise. Considering the width of this ocean, spreading rate is the same, greater, or less than that of the South Atlantic? Explain. (d) Now get the details. Provide the width of the South Pacific Ocean, as given in the farther figure on the right. km (e) What is the spreading rate of the East Pacific Rise? cm/yr km per million years These spreading rates are typical of the range measured throughout the world’s oceans and represent “fast spreaders” and “slow spreaders
Plz answer these questuin and mark on the diagram attact to it
Magnetic reversals are found worldwide, so magnetic anomaly
stripes should be the same width in every ocean if the rate of seafloor
spreading were the same at all mid-ocean ridges. If a particular anomaly
stripe is wider in one ocean than in another, however, the difference
must result from faster spreading. The figure on the right shows simplified magnetic anomaly stripes from the South Atlantic and South
Pacific oceans, the ages of the rocks in the stripes, and their distance
from the spreading center (the red line). For simplicity, only the
most recent 80 million years of data are shown for the two oceans,
and we will estimate the spreading rate only for that time span.
(a) Provide the width of the South Atlantic Ocean, as given in
the nearer figure on the right. km
(b) Estimate the average rate at which the South Atlantic
Ocean has been opening over the 80 million years for
which data are provided. cm/yr
km per million years
(c) Now look at the data for the South Pacific Ocean and its
spreading center, the East Pacific Rise. Considering the width
of this ocean, spreading rate is the same, greater, or less than
that of the South Atlantic? Explain.
(d) Now get the details. Provide the width of the South
Pacific Ocean, as given in the farther figure on the right.
km
(e) What is the spreading rate of the East Pacific Rise?
cm/yr km per
million years
These spreading rates are typical of the range measured throughout the world’s oceans and represent “fast spreaders” and “slow
spreaders
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