Recent Evidence Suggests That Mars Once Had a Global Magnetic

question 74

Multiple Choice

Recent evidence suggests that Mars once had a global magnetic field. Assuming this is true, which of the following could explain why Mars today lacks a global magnetic field like that of Earth?

• A)Mars is too far from the Sun to have a global magnetic field.
• B)Mars rotates much slower than the Earth.
• C)The Martian core is made of rock, while Earth's core is made of metal.
• D)Mars's interior has cooled so much its molten core layer no longer undergoes convection.

---

Definitions:

Levels

Distinct values or categories of a categorical variable.

Within-Group Estimate

An analysis focusing on the variation or relationships of variables within a single group.

Degrees of Freedom

The number of values in the final calculation of a statistic that are free to vary, often related to the number of independent observations in a dataset.

ANOVA

Acronym for Analysis of Variance, a statistical technique used to compare the means of three or more samples.