1. According to modern science, Earth is about 4.5 billion years old and written human history extends back about 10,000 years. Suppose you represent the entire history of Earth by 12 hours on a clock, with the birth of the Earth at the stroke of midnight and today at the stroke of noon. a) How much time on the clock represents 500 million years? b)How long before noon does written human history begin? 2. It took 65 million years from the time the dinosaurs were wiped out by an asteroid impact until humans arrived on the scene. Today, we have technology that could wipe out all humans if we do not use it wisely. Suppose we wipe ourselves out, and it then takes 65 million years for the next intelligent species to arise on Earth. Then suppose the same thing happens to them, with another intelligent species arising 65 million years later. If this process could continue until the Sun dies in about 5 billion years, how many more times could intelligent species arise on Earth at 65-million-year intervals?
1. According to modern science, Earth is about 4.5 billion years old and written human history extends back about 10,000 years. Suppose you represent the entire history of Earth by 12 hours on a clock, with the birth of the Earth at the stroke of midnight and today at the stroke of noon.
a) How much time on the clock represents 500 million years?
b)How long before noon does written human history begin?
2. It took 65 million years from the time the dinosaurs were wiped out by an asteroid impact until humans arrived on the scene. Today, we have technology that could wipe out all humans if we do not use it wisely. Suppose we wipe ourselves out, and it then takes 65 million years for the next intelligent species to arise on Earth. Then suppose the same thing happens to them, with another intelligent species arising 65 million years later. If this process could continue until the Sun dies in about 5 billion years, how many more times could intelligent species arise on Earth at 65-million-year intervals?
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