Question

True or False? When researchers compared the magnetic data from the ocean floor with the pattern of magnetic reversals on land, scientists were able to determine the age of the ocean floor. a) True b) False

Answer 1

Answer:

TRUE

Explanation:

The scientists examine the change in the magnetic field of the earth to determine the age of the ocean floor. Once in a while, the currents in the core of the ocean which create the magnetic field on the earth, are reversed. This is known as a geomagnetic reversal.

When the magnetic data of the sea floor was studied, they discovered about the normal and the reversed magnetic stripes.

The geomagnetic reversals records was matched with the stripes of the normal and the reverse magnetic fields, to determine the age of the ocean floor.

Therefore, the give statement is TRUE.

Answer 2

Answer:

TRUE

Explanation:

    In the early twentieth century several scientists, including Bernard Brunhes in France (in 1906) and Motonari Matuyama in Japan (in the 1920s), discovered that rocks can be divided into two groups: those with normal polarity (ie , where magnetic minerals are oriented according to the Earth's magnetic field): and those with reverse polarity (ie, the alignment of magnetic minerals is contrary to Earth's magnetic field).

    When the magma cools, the ferric elements orient themselves according to the existing magnetic field, "fossilizing" it. Thus, the existence of volcanic rocks with normal polarity and others with inverse polarity, presupposes that, in the geological past, there were periods when the terrestrial magnetic field was inverse from the present one, and others in which it was analogous to the present one, that is, occurred. magnetic field inversions. The geomagnetic reversals records was matched with the stripes of the normal and the reverse magnetic fields, to determine the age of the ocean floor.