Multiple choice

The core of the earth is thought to be composed of

  1. Radioactive metals

  2. Molten metallic sulphides

  3. Molten iron and nickel

  4. Molten copper and iron

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The inner core of the Earth, its innermost hottest part as detected by seismological studies, is a primarily solid ball. It is believed to consist of an iron-nickel alloy, and may have a temperature similar to the Sun's surface.