Question

The centre of the earth is a core, mainly containing:
A. Silicon that forms clay
B. copper that gives radiation
C. iron that creates a magnetic field
D. Magnesium that colors volcanic flames

Answer 1

Earth consists of various minerals, metals, and other substances on it. The Earth is divided into three parts as outer surface on which we live as crust, middle surface called the mantle, and the inner surface at the centre called core. The core of the earth is composed of various molten metals.

Complete answer:
Earth is the only planet where life exists. Earth consists of 3 parts that make up this planet. These parts are Crust, mantle and core. The crust is the outer surface where various minerals like silica, clay, etc are found, it also supports vegetation. The middle layer is the mantle that consists of mostly solid rocks and minerals.
The centre of the earth is called the core. The core is the innermost part of the earth. The metals that were found on the earth along with minerals went into the core of the earth due to gravitation. With time, heat and compression, these metals melted and the core constituted the molten metals. The major metals are iron and nickel. These metals are also responsible for the magnetic field of the earth and its planetary motion.
Hence, the centre of the earth is a core, mainly containing iron that creates a magnetic field.

So, option C is correct.

Note:
The crust, mantle and core are the 3 major layers of the earth. At the time of volcanic eruption, the molten rocks from the mantle come up on the surface of the earth as lava. The core of the earth is like a furnace that is a very hot region that can even melt the metals. Thus the core is made of NiFe, nickel and iron.