What are the sources of carbon dioxide gas?
Carbon dioxide gas is very necessary for the photosynthesis process of green plants to make their own food, and to build their bodies, It is a chemical compound which its molecule consists of one...
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Importance, structure and uses of periscope, How does a periscope work
The periscope is an instrument for observation over, around or through the object, obstacle or condition that prevents direct line-of-sight observation from the observer’s current position, The periscope is used to monitor the dangerous...
Military robots uses, importance, risks and types
Military robots are autonomous robots or remote-controlled devices which designed for military applications, They can walk through minefields, deactivate unexploded bombs or clear out hostile buildings.
What are the laws of light reflection?
Laws of light reflection The distance between the Earth and the Moon can be measured by the reflection of a laser beam directed from the Earth towards a reflection surface placed on the Moon...