Thermal Convection Movement in the Upper Mantle

question 12

Multiple Choice

Thermal convection movement in the upper mantle

• A)generates the electric current that powers Earth's magnetic field.
• B)greatly influences Earth's surface features.
• C)heats Earth's core by frictional forces.
• D)is usually negligible.

---

Definitions:

Deshielded

A term used in nuclear magnetic resonance (NMR) to describe a nucleus whose electron cloud is perturbed in such a way as to reduce the shielding effect, often leading to an upfield shift in the NMR spectrum.

Dibutyl Ether

An organic compound formed by the dehydration of butanol, used as a solvent and in chemical synthesis.

Atomic Number

The number of protons in the nucleus of an atom, which defines the element's identity.

Mass Number

The total number of protons and neutrons in an atom's nucleus, representing the atom's mass more closely than the atomic number.