Why are deposits of calcite common in caves? They often form stalactites, stalagmites, and other cave formations. But other minerals do not form such formations. Why?

Some minerals can often be identified based on a single property. Which common mineral has a resinous luster?

Oceans have evolved and changed size and shape since early in Earth history. How does this occur? Where does old ocean material go and where does new ocean material come from?

What does the Chicxulub hypothesis explain?

Graphite and diamond both have the same composition but are diferent minerals. Why?

Which of these is an objective oservation (as opposed to subjective)?

Which of these is a compound?

What is the overall average composition of Earth’s oceanic crust?

Which of these minerals is commonly found in limestones?

What layer of Earth makes up the plates that drift because of plate tectonics?