Question

What is the main piece of evidence supporting the theory of seafloor spreading?

Fossils of plants and animals along the ocean floor

Volcanic activity along the Ring of Fire

Glacial scratches on the seafloor

Alternating magnetic pattern in the rocks of the ocean floor

Answer 1

Answer:

Alternating magnetic pattern in the rocks of the ocean floor

Explanation:

The rocky sea floor on either side of mid-ocean ridges has a matching pattern of magnetic stripes. This information provides evidence for sea-floor spreading. The matching striped pattern shows that Earth’s polarity was recorded on either side of the ridge as lava oozed from the ridge and cooled.  

Answer 2

Answer:

Alternating magnetic pattern in the rocks of ocean floor.

Explanation:

• The ocean floor consists of several types of rocks.
• The mid-ocean ridges has a similar pattern as well as magnetic field lines.
• So this makes a clear evidence.