Which of the following shows the correct order of the inner planets? A: Mercury, Earth, Venus, Mars
B: Mars Mercury Venus Earth
C: Venus, Mars, Erath, Mercury
D: Mercury, Venus, Earth, Mars

Which of the following describes a compound? (hint: carbon and oxygen bo a. a piece of pure carbon, containing only carbon atoms b. oxygen gas surrounding a solid piece of carbon c. a substance made of two oxygen atoms for each carbon atom carbon and oxygen atoms mixed without being bonded together