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Which of the following are not linear constraints?

What features allow geologists to determine the farthest advance of Pleistocene glaciers?

From previous question, this theory is called the 

Over 26,000 years, Earth’s rotational axis slowly changes orientation or “wobbles”. This is called:

​The Himalayan orogeny is the result of a collision between Africa and Eurasia.

Bonus Question (worth up to 5 points):  Suppose that we lived in a galaxy other than the Milky Way – a galaxy that was a different type (see questions #1 and #16 for examples of types of galaxies).  Discuss two aspects that could possibly be different or similar in this new galaxy.  See rubric for further instructions.  This is an opinion question, but the support must be based on Unit 3 content as discussed in the lecture recordings. You must throughly explain your reasoning for credit. No credit will be given for submissions without explanations. All words and work must be your own and will be checked for plagiarism.  Any evidence of plagiarism or the use of AI will result on a 0 on the entire exam and will be reported to Student Code of Conduct for further possible disciplinary actions.  Rubric:  Please write your answer in this format to help me with the grading process: New Galaxy Type: (For example, elliptical) New Feature #1: 1 point Explanation as to why: 1.5 points New Feature #2: 1 point Explanation as to why: 1.5 points You must first state the galaxy type as the supporting details have to be correct for that type of galaxy for credit on this question.

The Universe is __________, meaning that the density __________. Select two and only two answers.  If you select more than two answers, you will receive 0 credit on this question. 

What percentage of Earth’s present-day land surface is covered by glaciers?

A flooded U-shaped glacial trough or valley is called a:

In _________ transport in deserts, sediments move by saltation, rolling, or sliding.