This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: Briefly explain how magnetic reversals in oceanic crust and fossils in ocean sediments are used to ... (Read 40 times)

jhjkgdfhk

  • Hero Member
  • *****
  • Posts: 569
on: Jul 15, 2018

Briefly explain how magnetic reversals in oceanic crust and fossils in ocean sediments are used to
  construct a magnetic time scale. What will be an ideal response?



Question 2

How does seafloor spreading explain the movement of the continents? What will be an ideal response?


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

yahahah24021

  • Sr. Member
  • ****
  • Posts: 323
Reply #1 on: Jul 15, 2018
Answer to Question 1

A terrestrial sequence of magnetic reversal in volcanic deposits was dated radiometrically. These dates
were extrapolated to regions which were not dated, but showed the same pattern of normal and
reversed magnetic polarities. Ages of ocean-floor basalts lying within a zone of normal or reversed
polarity are dated by the ages of the fossils found in the sediments that directly overlie the basaltic
crust. These fossils have already been incorporated within a biostratigraphic zone.



Answer to Question 2

With seafloor spreading, the continents and oceanic crust move together as part of large plates. The
plate is pushed by the formation of new ocean crust and pulled by the subduction of old ocean crust.
New crust forms due to seafloor spreading.



jhjkgdfhk

  • Hero Member
  • *****
  • Posts: 569
Reply #2 on: Jul 15, 2018
TY


yahahah24021

  • Sr. Member
  • ****
  • Posts: 323
Reply #3 on: Jul 15, 2018
Happy to Help


« previous next »
 

Did you know?

According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.

Did you know?

Lower drug doses for elderly patients should be used first, with titrations of the dose as tolerated to prevent unwanted drug-related pharmacodynamic effects.

Did you know?

The first successful kidney transplant was performed in 1954 and occurred in Boston. A kidney from an identical twin was transplanted into his dying brother's body and was not rejected because it did not appear foreign to his body.

Did you know?

People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.

Did you know?

Drugs are in development that may cure asthma and hay fever once and for all. They target leukotrienes, which are known to cause tightening of the air passages in the lungs and increase mucus productions in nasal passages.

An example of layers, or strata, of sedimentary rock that contain fossils An example of layers, or strata, of sedimentary rock that contain fossils
Discovering Fossils 11-30 Discovering Fossils 11-30
A typical magnetic crankshaft position sensor. A typical magnetic crankshaft position sensor.
A stylized bathymetric profile of the ocean A stylized bathymetric profile of the ocean
Major Surface-Ocean Currents Major Surface-Ocean Currents
A solenoid has an area of 41.0 cm2. Find the change in magnetic flux through the solenoid. A solenoid has an area of 41.0 cm2. Find the change in magnetic flux through the solenoid.
Video: Oral Hygiene & Braces Animation

For a complete list of videos, visit our video library