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

Passage: When water freezes in a non-crystalline, amorphous form as frost, the water molecules are fixed in place, but not in a regular, repeating pattern. Frost and other amorphous solids are characterized by their unorganized and unpredictable structure. Because ice comes in both amorphous and crystalline forms, there are differences in the physical properties of ice such as its hardness and density. Answer: amorphous
What kind of solid is characterized by an unorganized and unpredictable structure?

Passage: With the naked eye, bacteria just look like a slimy smear on a petri dish. How can we study them in more detail? The invention of the microscope has allowed us to see bacteria, cells, and other things too small to be seen with the naked eye. Answer: slimy smear
How does the bacteria look when seen with the naked eye?

Passage: A lake is an example of a freshwater biome. Water in a lake generally forms three different zones based on water depth and distance from shore. Answer: freshwater biome
A lake is an example of what type of biome?