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

Ex Input:
Passage: From a human point of view, natural resources can be classified as either renewable or nonrenewable. Answer: renewable or nonrenewable

Ex Output:
How can natural resources be classified from a human point of view?

Ex Input:
Passage: Figure 20.13 Diabetes is a disease characterized by high concentrations of glucose in the blood. Treating diabetes involves making lifestyle changes, monitoring blood-sugar levels, and sometimes insulin injections. (credit: "Blausen Medical Communications"/Wikimedia Commons). Answer: diabetes

Ex Output:
What is a disease characterized by high concentrations of glucose in the blood?

Ex Input:
Passage: Each type of rock weathers in its own way. Certain types of rock are very resistant to weathering. Igneous rocks tend to weather slowly because they are hard. Water cannot easily penetrate them. Granite is a very stable igneous rock. Other types of rock are easily weathered because they dissolve easily in weak acids. Limestone is a sedimentary rock that dissolves easily. When softer rocks wear away, the more resistant rocks form ridges or hills. Answer: weathering

Ex Output:
Hard igneous rocks and easily dissolved sedimentary rocks respond very differently to what natural force?