a flat piece, usu. of wood, metal, or plastic, hinged vertically near the stern of a boat or ship for steering.
is essential to life on Earth, a component of all proteins and it can be found in all living systems, compounds are present in organic materials, foods, fertilizers, explosives and poisons.
an artificial waterway constructed to allow the passage of boats or ships inland or to convey water for irrigation.
an embankment built to prevent the overflow of a river.
industry that processes and markets sugar; most sugar is extracted from sugar cane
impossible to pass through or enter:
a large, dangerous semiaquatic pit viper that inhabits lowland swamps and waterways of the southeastern US.
A large, white, bald-headed wading bird of the southeastern swamps
a large fish-eating wading bird with long legs, a long S-shaped neck, and a long pointed bill.
a mechanical device for propelling a boat or aircraft, consisting of a revolving shaft with two or more broad, angled blades attached to it.
when a bird straightens and cleans its feathers with its beak
a continuing sound, especially of someone's voice, that is unchanging in pitch and without intonation
a biological community of interacting organisms and their physical environment.
a terrestrial arachnid with lobsterlike pincers and a poisonous sting at the end of its jointed tail, which it can hold curved over the back.