Earth's Innermost Core Is Solid, Not Liquid, Because

question 80

Multiple Choice

Earth's innermost core is solid, not liquid, because:

• A) the core temperature is too low to melt iron
• B) differentiation caused all of the heavy, solid material to sink to the bottom while Earth was forming
• C) all the liquid has moved up into the mantle via convection
• D) the pressure is too high for the material to be in a liquid state
• E) Iron does not melt

---

Definitions:

Physical Resources

Tangible assets used in the production or delivery of goods and services, such as machinery, buildings, and raw materials.

Scarcity

The fundamental economic problem of having seemingly unlimited human wants and needs in a world of limited resources.

Opportunity Cost

Renouncing the possibility of gains from different alternatives by making a single choice.

Human Desire

The intrinsic motivation or want for specific outcomes, experiences, or material possessions.