How do the parallel magnetic stripes near mid-ocean ridges form quizlet?

How do the parallel magnetic stripes near mid-ocean ridges form quizlet?

Explain why magnetic strips on the seafloor are parallel to the mid-ocean ridge. New rock is formed when lava erupts along the length of the ridge. When the seafloor spreads, this rock separates and moves in opposite directions, forming lines that are parallel to the ridge.

How are magnetic stripes near mid-ocean ridges evidence for sea floor spreading?

The specific magnetism of basalt rock is determined by the Earth’s magnetic field when the magma is cooling. Scientists determined that the same process formed the perfectly symmetrical stripes on both side of a mid-ocean ridge. The continual process of seafloor spreading separated the stripes in an orderly pattern.

Why do magnetic stripes on the ocean floor form a symmetrical pattern on either side of mid-ocean ridges?

When lava gets erupted at the mid-ocean ridge axis it cools and turns into hard rock. As it cools it becomes permanently magnetized in the direction of the Earth’s magnetic field. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges.

What does it mean when ridges or rises have wider or thicker magnetic stripes on the sea floor rather than thinner stripes?

As you move further away from the ridge crests, the age of the magnetic stripes increases. This is due to the process of seafloor spreading that creates new crust and pushes the old crust away. So the further away from the ridge you go, the older the crust will be. Some magnetic stripes are wider than others.

What causes magnetic anomalies on the sea floor?

The source of these anomalies is primarily permanent magnetization carried by titanomagnetite minerals in basalt and gabbros. They are magnetized when ocean crust is formed at the ridge. As magma rises to the surface and cools, the rock acquires a thermoremanent magnetization in the direction of the field.

What does the pattern of magnetic stripes on the seafloor indicate?

When lava gets erupted at the mid-ocean ridge axis it cools and turns into hard rock. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges. These patterns of stripes provide the history of seafloor spreading.

Which magnetic stripe is the oldest How do you know?

The north pole becomes the south pole, and the south pole becomes the north pole. Rocks of normal and reversed polarity are found in stripes symmetrically about the mid-ocean ridge axis. The seafloor is youngest at the ridge crest and oldest far away from the ridge crest.

What are the magnetic stripes of the mid ocean ridge?

At the mid-ocean ridge spreading axis, these flips in the direction of the Earth’s magnetic field are recorded in the magnetization of the lava. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges. These patterns of stripes provide the history of seafloor spreading.

When was magnetic stripes discovered on the seafloor?

The discovery of magnetic stripes on the seafloor in the 1950s validated the plate tectonics theory for the geological community. The theory of plate tectonics states that the lithosphere, which is the Earth’s outer layer, is divided up into a dozens of irregularly shaped plates.

How are magnetic anomalies related to slow spreading ridges?

At slow spreading ridges, the anomalies are squeezed tighter together, but the basic patterns are quite similar so scientists can correlate or relate the magnetic wiggles to different parts of the global mid-ocean ridge. DEEPER DISCOVERY Axial Ridge

What happens to lava at the mid ocean ridge?

When lava gets erupted at the mid-ocean ridge axis it cools and turns into hard rock. As it cools it becomes permanently magnetized in the direction of the Earth’s magnetic field.