http://www.physicalgeography.net/physgeoglos/b.html Big Bang http://www.physicalgeography.net/physgeoglos/b.html Bird barometer barometer Btu Bar biosphere British thermal unit biosphere http://www.physicalgeography.net/physgeoglos/b.html biotic http://www.physicalgeography.net/physgeoglos/b.html British thermal unit biosphere Beach Basic http://www.physicalgeography.net/physgeoglos/b.html basic barometer Btu Backshore