What are three things that happened during the first 2 billion years of the Earth’s history that have helped make the planet suitable for complex life?

. You just built a time machine but unfortunately haven’t worked out all the kinks yet – when you set it for the year 4 BC it drops you off 4 Billion years ago! Why would this be a bad thing for your chances of survival?

. What are three things that happened during the first 2 billion years of the Earth’s history that have helped make the planet suitable for complex life?

15. Complete the chart for the examples of 3 types of rock that make up the rock cycle.Rock NameWhich Type of Rock?How is it Formed?What Does it Look Like?LimestoneMarbleObsidian 16. Please answer the following questions based on principles of relative dating and the diagram below:a. Which layer is older, Layer A or Layer C?b. Were the pink bricks on the right-hand side of the diagram formed in the same layer as the pink bricks on the left-hand side?c. Which is the youngest layer shown – A, B, C, or D?d. What do you think E is? What happened here? 17. A mammoth bone is found to contain roughly 5% of the isotope C-14. Living elephant bones commonly contain about 40% C-14. Given that C-14 has a half-life of 5,730 years, how long ago did this mammoth die? Please show your work. (hint: no complex math is needed to solve this problem)

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