What provides the power to change igneous, sedimentary, and metamorphic rocks into sediment?

Using complete sentences, describe the central economic problem facing all humans. why does this require people to make choices? how can this result in opportunity costs?

Which of the following is typically not a characteristic of a foraging society? a. foraging societies are nomadic groups. b. foraging societies consist of small groups with ties based on kinship. c. individuals in foraging societies have few personal possessions. d. foraging societies have formal social and class structures

What are the similarities and differences in the way geologists and biologists approximate the age of the earth? justify your response in two or more complete sentences.