Consider the following statements and choose the correct one s Rocks closer to the mid oce...........

Geography Earth Geology

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Consider the following statements and choose the correct one/s:

Rocks closer to the mid-oceanic ridges are normal polarity and are the youngest.
Sediments on the ocean floor are generally thin.
The deep trenches have deep-seated earthquake occurrences while in the mid- oceanic ridge areas, the quake foci have shallow depths.

Code:

2 Only

3 Only

1 and 2

1, 2 and 3

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Explanation:

1, 2 and 3

Statement 1: Rocks closer to the mid-oceanic ridges have normal polarity and are the youngest. The age of the rocks increases as one moves away from the crest. The ocean crust rocks are much younger than the continental rocks.

Statement 2: Total sediment thickness varies on a regional scale. It's generally thicker and larger grained near the coasts and thinner and finer grained further out to sea.

Statement 3: The deepest earthquakes occur within the core of subducting slabs - oceanic plates that descend into the Earth's mantle from convergent plate boundaries, where a dense oceanic plate collides with a less dense continental plate and the former sinks beneath the latter. Mid-ocean ridges and transform margins have shallow earthquakes (usually less than 30 km deep), in narrow bands close to plate margins. Subduction zones have earthquakes at a range of depths, including some more than 700 km deep.