This is the densest part of the earth believed to be composed of iron and nickel which is responsible for earth's magnetism. Identify it.

1. Mantle
2. Core
3. Crust
4. None of the above

Assertion (A): Sial appears to float above Sima.

Reason (R): Sial has lower density than Sima.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R does not explain A.
3. A is true but R is false.
4. A is false but R is true.

Which of the following is incorrect about the inner core?

1. It is in a molten state.
2. It is a region of high density.
3. It is a region of high pressure.
4. It is composed of iron and nickel.

At the depth of around 100-410 km, mantle is partially molten and is known as:

1. Asthenosphere
2. Mantlenosphere
3. Moltenosphere
4. None of the above