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 92 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?

The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.

Did you know?

About 3% of all pregnant women will give birth to twins, which is an increase in rate of nearly 60% since the early 1980s.

Did you know?

Many people have small pouches in their colons that bulge outward through weak spots. Each pouch is called a diverticulum. About 10% of Americans older than age 40 years have diverticulosis, which, when the pouches become infected or inflamed, is called diverticulitis. The main cause of diverticular disease is a low-fiber diet.

Did you know?

Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

Did you know?

The familiar sounds of your heart are made by the heart's valves as they open and close.

Heading for the ocean on a beach at the Pu'uhonua o Honaunau National Historical Park Heading for the ocean on a beach at the Pu'uhonua o Honaunau National Historical Park
Discovering Fossils 08-30 Discovering Fossils 08-30
This modified model of Easton’s systems theory puts government decision makers as the source of pol This modified model of Easton’s systems theory puts government decision makers as the source of pol
Fossils as indicators of climate Fossils as indicators of climate
Polar Ocean Productivity Polar Ocean Productivity
Vision-based Magnetic Compass in European Robins Vision-based Magnetic Compass in European Robins
Video: Effect of blood chemistry - stimuli, hyperventilation response and hypoventilation response

For a complete list of videos, visit our video library