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

Ex Input:
Passage: The electron cloud of a helium atom contains two electrons, which can normally be expected to be equally distributed spatially around the nucleus. However, at any given moment the electron distribution may be uneven, resulting in an instantaneous dipole. This weak and temporary dipole subsequently influences neighboring helium atoms through electrostatic attraction and repulsion. It induces a dipole on nearby helium atoms (see Figure below ). Answer: an instantaneous dipole

Ex Output:
A weak and temporary dipole that influences nearby atoms through electrostatic attraction and repulsion is known as what?

Ex Input:
Passage: Bacteria are so small that they can only be seen with a microscope. When viewed under the microscope, they have three distinct shapes ( Figure below ). Bacteria can be identified and classified by their shape:. Answer: by their shape

Ex Output:
How are bacteria identified and classified?

Ex Input:
Passage: There are two major types of seismic waves. Body waves travel through the Earth's interior. Surface waves travel along the ground surface. In an earthquake, body waves are responsible for sharp jolts. Surface waves are responsible for rolling motions that do most of the damage in an earthquake. Answer: seismic waves

Ex Output:
Body waves and surface waves are the two major types of what, which occur during earthquakes?