I’m a freshman and i don’t get this at all

4- Option (A)

5- Option (A)

Explanation:

From the given image, it can be clearly marked that all the layers of the earth's interior is comprised of iron in association with the silicates and other siderophile elements. Iron is present in earth in a large amount, and it is one of the dense mineral. This iron concentration is maximum at the core due to which the core of the earth has the highest density.

The Midwest was a sea-bed about 10,000,000 years back. It was because during that time the atmosphere of the earth was very warm, due to which the water present on the surface of the earth were evaporated, and rainfall occurred so heavily and continuously for many centuries, increasing the sea level.

Thus, the correct answers are-> 4- option (A) and 5- option (A).