Earth is made up of?

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liquid

water

solid

both 1 and 3

answer is D.

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Detailed Solution

The core is the center of the Earth and consists of two parts: the liquid outer core and the solid inner core. So option 4 is correct. The outer core is made of nickel, iron and molten rock.
The Earth's mantle is located above the core and consists of rock containing silicon, iron, magnesium, aluminum, oxygen and other minerals. The earth's crust is composed mainly of oxygen, silicon, aluminum, iron, calcium, sodium, potassium and magnesium. Earth's surface is mostly covered in liquid water, and its atmosphere is mostly nitrogen and oxygen, with smaller amounts of carbon dioxide, water vapor, and other gases.

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