Question 1
Heavy elements like Pb (lead) and U (Uranium) were generated ________.
◦ by the Sun and expelled to the solar system via the solar wind
◦ by humans in nuclear reactors
◦ during the big band when the universe was formed
◦ during collapse of a star and subsequent nuclear synthesis in a supernova
Question 2
Which of the following minerals is
not a chemical compound?
◦ graphite (C)
◦ quartz (SiO
2)
◦ halite (NaCl)
◦ pyrite (FeS)