To what class of minerals do gold silver and copper belong

With the word calcite wich completes the analogy mineral, erosion, marble, or aragonite

The negative impacts of nonnative species generally outweigh the positive impacts

The earths core is made up mainly of what 2 substances? 2. like an egg, earth has a core, a layer surrounding the core, and a thin, hard outer layer. which layers of the earth match the layers of an egg?