<human>: What is the difference between an elm and an oak tree?
<bot>: An elm is a type of deciduous tree that typically grows to be about 30-50 feet tall. It has smooth, gray bark with small, light green leaves that turn yellow in autumn. An oak tree is a type of deciduous tree that typically grows to be about 50-100 feet tall. It has rough, deeply furrowed bark with large, leathery leaves that turn red or brown in autumn.