How old are the oldest rocks of the ocean floor?

less than 200 million years old

between 200 and 500 million years old

approximately 500 million years old

approximately one billion years old

Hey There,

The answer to your question is option B) Between 200 and 500 million years old.

These rocks are younger than the Earth and also younger than rocks found on continents. (Those rocks are 4-5 billion years old.)

Best Of Luck,

- Kai -

less than 200 million years old

Explanation:

The oceanic crust is composed essentially of basalt, formed by magnesian silicates (hence formerly called sima). It is 5 to 10 km thick and is denser than the continental crust because it contains more iron. Seismic waves have a speed of 7 km / s.

Ocean dorsals are geologically young relief forms, so none of the existing dorsals are more than 200 million years old, which can be considered very little compared to the 4.6 billion years that Earth has.