Wood has been an important construction material since humans began building shelters, houses and boats. Nearly all boats were made out of wood until the late 19th century, and wood remains in common use today in boat construction. Elm in particular was used for this purpose as it resisted decay as long as it was kept wet (it also served for water pipe before the advent of more modern plumbing). COUNT 5
QSN1 What wood is decay-resistant when wet? ANS1 Elm QSN2 What plumbing component was once made out of elm? ANS2 water pipe QSN3 Until the late 19th century, what vessels were almost always wooden? ANS3 boats QSN4 What significant purpose has wood been used for as long as humans have built shelters? ANS4 construction material QSN5 Other than boats, what do people often build with wood? ANS5 houses