Given a scientific passage and an answer, generate a question for the given answer.

[EX Q]: Passage: Figure 29.17 The tails of the Hale-Bopp comet point away from the Sun, evidence that light has momentum. Dust emanating from the body of the comet forms this tail. Particles of dust are pushed away from the Sun by light reflecting from them. The blue ionized gas tail is also produced by photons interacting with atoms in the comet material. (credit: Geoff Chester, U. Navy, via Wikimedia Commons). Answer: momentum
[EX A]: The tails of the hale-bopp comet point away from the sun, evidence that light has what property of motion?

[EX Q]: Passage: Runoff is likely to cause more erosion if the land is bare. Plants help hold the soil in place. The runoff water in Figure below is brown because it eroded soil from a bare, sloping field. Can you find evidence of erosion by runoff where you live? What should you look for?. Answer: erosion
[EX A]: Runoff is likely to cause more what if the land is bare?

[EX Q]: Passage: Mid-latitude cyclones form at the polar front. Two very different air masses blow past each other in opposite directions. The Coriolis effect causes winds to strike the polar front at an angle. Warm and cold fronts form next to each other. Answer: coriolis effect
[EX A]:
Which effect causes winds to strike the polar front at an angle?