Question

(e) What is the inner core of the Earth composed of?
Why are igneous rocks called primary rocks?​

Answer 1

Answer:

The solid, inner core of iron has a radius of about 760 miles (about 1,220 km), according to NASA. It is surrounded by a liquid, outer core composed of a nickel-iron alloy.

Igneous rocks are often called primary rocks because they are at the start of the rock cycle.

Explanation:

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Answer 2

Answer:

HI MATE !

• IRON :- Earth's inner core is the innermost geologic layer of the Earth. The inner core is a hot, dense ball of (mostly) iron. It has a radius of about 1,220 kilometers (758 miles). Temperature in the inner core is about 5,200° Celsius (9,392° Fahrenheit). The pressure is nearly 3.6 million atmosphere (atm).

• Igneous rocks are known as primary rocks as they are formed through the cooling and solidification of magma or lava. The magma can be derived from partial melts of existing rocks in either a planet's mantle or crust. All other rocks are derived from them, so they are also called as parent rock.

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