Most strokes and heart attacks are caused by the abnormal clotting of blood in an unbroken vessel. moreover, a piece of the (clot) may break loose and begin to travel in the bloodstream as a(n)

-efficient data acquisition

-medical data processing

-data analysis for research

-voice recognition systems

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

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igneous rocks are formed by solidification of cooled magma (molten rock), with or without crystallization, either below the surface as intrusive (plutonic) rocks or on the surface as extrusive (volcanic) rocks.  

the composition depends on the source magma. there are almost a thousand types of composition found till now.  

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