which of the following terms refers to the practical applications of scientific
knowledge?
o a. systems science
o b. medicine
o c. technology
o
d. scientific methods

technology

Explanation: he practical use of science is called is technology. Technology is the practical application of scientific knowledge

there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

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.  

hope this