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

Input: Consider Input: Passage: Physical properties include color, density, hardness, and melting and boiling points. Answer: physical

Output: Hardness, density, color, and melting and boiling points are all considered what types of properties?

Input: Consider Input: Passage: Renewable resources are natural resources that can be replaced in a relatively short period of time or are virtually limitless in supply. Renewable energy resources include sunlight, moving water, wind, biomass, and geothermal energy. Each of these energy resources is described in Table below . Resources such as sunlight and wind are limitless in supply, so they will never run out. Besides their availability, renewable energy resources also have the advantage of producing little if any pollution and not contributing to global warming. The technology needed to gather energy from renewable resources is currently expensive to install, but most of the resources themselves are free for the taking. Answer: renewable resources

Output: What are natural resources which can be replaced in a relatively short period called?

Input: Consider Input: Passage: After leaves turn color in the fall, they may all fall off the plant for the winter. Plants that shed their leaves seasonally each year are called deciduous plants . Shedding leaves is a strategy for reducing water loss during seasons of extreme dryness. On the downside, the plant must grow new leaves in the spring, and that takes a lot of energy and matter. Some plants may "bank" energy over the winter by storing food. That way, they are ready to grow new leaves as soon as spring arrives. Answer: deciduous plants
Output: What do we call plants that shed their leaves seasonally each year?