Choosing Materials for Society Practice Test

A town is rebuilding a damaged bridge and must choose a building material. They need the bridge to hold heavy loads for many years.

• Wood: renewable and often cheaper, but can rot and has lower strength for very heavy loads.
• Concrete: durable and strong, but its production releases a lot of carbon dioxide.
• Steel: very strong and recyclable, but expensive and may require rust protection.

Which material choice best matches the main requirement of high strength for heavy loads while also allowing recycling at the end of its life?

A small island community needs to build storm shelters. The island has very few trees, but it can import materials by ship (which is expensive). Options include:

• Wood: renewable, easier to work with, but limited locally and has fire/rot risks.
• Concrete: very durable and strong, but making it uses lots of energy and it is heavy to ship.
• Steel: very strong and recyclable, but usually the most expensive and can rust without protection.

Which factor is most directly related to resource availability in this situation?