1) The Earth's core is primarily composed of iron and nickel and is as hot as the surface of the sun.

2) Democracy is a system of government in which power is vested in the people, who exercise it through elected representatives. It allows for political participation, freedom of speech, and protection of individual rights and liberties.

3) The eye of a cyclone is a region of calm, relatively clear skies and light winds at the center of the storm.

4) Cyclones play a vital role in Earth's climate system by redistributing heat and moisture, maintaining global temperature patterns, and influencing weather patterns.