Why is knowledge of compression and tension important when building bridges?

How the River Thames got its name? Sustainable development in the Amazon rainforest? What island was nicknamed Ellis Island of the West because it was a major immigrant processing station in the early part of the twentieth century? Which ocean is growing in size which is shrinking and why is it occurring? Was most slaves owened by people living in the central and northern parts of Arkansas? How many water parks does Turkey have? How many river deltas are there in the world? Where are the most of the deserts found in east Asia? What materials do you use to build wigwams? Why is the river said to be lazy? What is the full name of the San Jose Mission? What kind of housing did Mackenzie Yukon river basin first nations live in? What continent does the river Mississippi flow through? Where was a hundred yards over the rim filmed? What is the most likely reason that a long beak could be an adaptation for a bard living in a temperate forest? What states dose not share its name with a U.S river? Debating on cigarette factory should be closed down? Why was Lincoln chosen to be on Mt Rushmore? How many people showed up on the first day opening of Disney World? How much does the three gorges dam cost to build?