Multiple choice

The mapping of the ocean floor and palaeomagnetic studies of rocks from oceanic regions revealed some facts. Which of the following is incorrect about these studies?

  1. All along the mid oceanic ridges, volcanic eruptions are common and they bring huge amounts of lava to the surface.

  2. Rocks closer to the mid-oceanic ridges have normal polarity and are the youngest.

  3. The ocean crust rocks are much older than the continental rocks.

  4. The sediments on the ocean floor are unexpectedly very thin.

  5. The deep trenches have deep seated earthquake occurrences and the mid oceanic ridges have shallow depths of earthquakes.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

This statement is incorrect. The ocean crust rocks are much younger than the continental rocks. The age of rocks in the oceanic crust is nowhere more than 200 million years old. Some of the continental rock formations are as old as 3,200 million years.

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