Listing "Earth Articles" from 61 to70

Telegraph
First telegraph message was transmitted by Morse from Washington to Baltimore in 1844 and read "What hath God wrought?"...
by Manpreet
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Tank
Tanks were a decisive weapon in the two world wars of this century. Preceded by an artillery barrage...
by Manpreet
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Wonder World Under Water [V] - Animals with jointed Limbs
Just as insects dominate the land, having the largest population and variety, their relatives the Crustacean dominate the waters...
by B.F. Chhapgar
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Propeller
The basic idea of the propeller is the same as that of the turbine...
by Manpreet
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Machine Gun
In 1865 the French officer Reffye invented a machine gun with a total of 25 fixed barrels, which fired 125 to 150 missiles a minute...
by Manpreet
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Petroleum
We have no idea how long ago men first found petroleum or mineral oil...
by Manpreet
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Jet Engine
The jet engine works by ejecting a stream of gas at high velocity and high pressure, to produce a thrust...
by Manpreet
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Wonder World Under Water [IV] - Sea Anemones and Jelly Fish
The sea anemone has a hollow body with its mouth at the top in the center of a whorl of many finger-like projections called tentacles...
by B.F. Chhapgar
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Wonder World Under Water [III] - Sponges
While the most primitive animals are made of one cell, sponges are multicellular...
by B.F. Chhapgar
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Plastic
There can be no doubt that this is an age of plastics...
by Manpreet
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