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a long period when there is little or no rain
Drought
a wall built across a river that stops the river's flow and collects the water, especially to make a reservoir that provides water for an area
Dam
an area of sea water separated from the sea by a reef
Lagoon
a line of rocks or sand just above or just below the surface of the sea, often dangerous to ships
Reef
a place for storing liquid, especially a natural or artificial lake providing water for a city or other area
Reservoir
sand or soil that is carried along by flowing water and then dropped, especially at a bend in a river or at a river's opening
Silt
What is this?
Canal
What is this sign means?
radioactive substance
What is this sign means? (Def: a place where a railway and a road cross each other)
Level crossing
the branch of physics concerned with the properties of sound.
acoustics
the scientific study of the universe and of objects that exist naturally in space, such as the moon, the sun, planets, and stars
astronomy
the study of objects that are shot or thrown through the air, such as a bullet from a gun
ballistics
the science or art of making or drawing maps
cartography
the study of the effect of physical forces on objects and their movement
mechanics
the job of examining people's eyes and selling glasses or contact lenses to correct sight problems
optometry
What is the word part, -logy, means?
the science or the study of
