Q: Q: What are reactions that can occur only in one direction called? Choices: - permanent - instantaneous - critical - irreversible A:
A: irreversible

Q: Q: Extrusive igneous rocks are also called what? Choices: - metamorphic - agates - magma minerals - volcanic rocks A:
A: volcanic rocks

Q: Q: What is a soft, gray, nontoxic alkaline earth metal? Choices: - pewter - magnesium - potassium - calcium A:
A: calcium

Q: Q: What is the study of structure, properties, and interactions of matter? Choices: - petrology - biology - geology - chemistry A:
A: chemistry