List of Words for Letter ‘O’
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objective lens
the lens on the bottom of a microscope's body tube
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ocean current
a continuous flow of ocean water along a definite path
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ocean trench
a long, narrow, deep valley on the ocean floor
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oceanic crust
crust that lies below the oceans and made up mostly of basalt.
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oceanic zone
the zone that lies beneath the neritic zone and is divided into two areas based on depth: the bathyal zone and the abyssal zone.
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ocular lens
the lens at the top of a microscope's body tube, nearest the observer's eye
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oil
a thick, black substance that forms underground, over millions of years, from decaying sea creatures and plants and also called petroleum
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old growth forest
an ecosystem in which trees have grown undisturbed for a long time
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omnivore
an animal that eats both producers and consumers
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oscillate
to swing back and forth
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oxbow lake
a portion of a stream channel that is cut off from the rest of the stream by erosion