What is the abstract noun of opportune?

Where is the aloe plant found? Does a change in temperature cause gases to expand? Why is earth not written in capital all the time? Can you extend an existing wire by just using wire nuts and electrical tape and no junction box? Greyish white element used in lamp filaments? What is the central point of a selection? What are the metals on periodic table? When is the next eclipse over France? What metal casket is most expensive? Why is polyvinylidene chloride a stickier plastic than polyethylene'? What does a electron dot diagram tell you about a element? What would the world be without coordinate plane? What are the characteristic properties of liquid? What is keratin made from? What was the year 13 years ago? Are compression waves in an electromagnetic spectrum? How do you separate sand grains from salt grains? How is the carbon cycle important in understanding global warming and everything? Is expressed in grams g kilograms ir milligrams? What are earth 5 systems?