We take natural resources, often plentiful, apply labor + skill, and get a more valuable product. We're wealthier as a result.
Yes, natural resources are finite, but not the limiting reagent for most things. There's a zero-sum game in that land used for farming is not available for an entertainment complex. But we have so much used for "nothing" that switching it to "something" is a giant increase in wealth. You can buy an acre in Kansas for a month's worth of minimum wage work. Las Vegas was built in a desert surrounded by hundreds of miles of wasteland. Did turning land, earth, trees, and iron ore into Las Vegas add zero value? (Not saying it was the best use of resources, just that assembling buildings improved the value of the raw materials.)
As a counterexample, consider melting down a car into slag. Are you less wealthy with your charred steel than a working car? Of course -- charred steel is less valuable. The number of atoms is the same. In other words, is an assembled watch worth the same as a pile of gears? Are you indifferent to the two?
If wealth were fixed in the earth, we must be getting poorer as the population grows. A few thousand years ago we had 1M people on earth. Were those peasants 7000x wealthier than us?