What is the hardest mineral in this group?
a. calcite
b. quartz
c. diamond
d. gold

If y gets smaller as x gets bigger and y have an relationship?

When barack obama was running for president, at a campaign stop he tried to bowl, something he isn't very good at. the media loved it because he threw a gutter ball while they were all watching. this is an example of:

Apropagating wave in space with electric and magnetic components. these components oscillate at right angles to each other. it may travel in a vacuum.