Suppose a deposit of gold-containing rock was discovered, and geologists determined that the amount of gold in the rock was too little to be worth the expense of mining it. Would this gold deposit be called gold ore

the supermassive black hole is in the middle of the galaxy.

for example, no new evidence will demonstrate that the earth does not orbit around the sun (heliocentric theory), or that living things are not made of cells (cell theory), that matter is not composed of atoms, or that the surface of the earth is not divided into solid plates that have moved over geological timescales .

plato users:

d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.