4. Geologists have determined that the Earth is about 4.57 billion years old (4,570,000,000 years). a. If you wanted to represent this length of time with a roll of receipt paper so that one inch of the paper represents one million years, how long would the paper have to be (in inches)? b. Convert the paper's length (inches) to miles. c. What is the paper's length in kilometers? 5. Today, the Atlantic Ocean is about 5,700 km wide at the latitude of Boston. At one time, there was no Atlantic Ocean because the North American continent and the African continent were joined. Then, 185,000,000 years ago, the two continents moved apart by a process called seafloor spreading. a. Assuming the rate of seafloor spreading has been constant, what rate has North America been moving away from Africa in kilometers per year? b. What is this rate in centimeters per year?