Earthquakes on plate boundaries happen more because the plates all move in different directions in a tectonic environment so they collide against each other which makes them more frequent. Earthquakes rarely happen in intra-plate environments but along faults in normally stable interior of the plates. If this doesn't make sense, ask me to reword it for you !
It is false that Qualitative research generally uses numbers to represent research data. Qualitative research is more on descriptions and meanings.Quantitative research is the word for this description.
Answer:
aluminium, copper, iron, tin, gold,
I believe the answer is "biodegradable". Hope this helps!