1. Explore how the specific strength, σv/ρ has increased over time. [Here σv is the yield strength and ρ is the density]. To do so, make a chart with σv/ρ on the y-axis and Date first used on the...

1. Explore how the specific strength, σv/ρ has increased over time. [Here σv is the yield strength and ρ is the density]. To do so, make a chart with σv/ρ on the y-axis and Date first used on the x-axis, using linear scales for both.

2. Explain the distinction between reserves and the resource base.

3. Use the Internet to research rare-earth elements. What are they? Why are they important? Why is there concern about their availability?