If the Atlantic seafloor is spreading at 2.9 cm/year and is now 6,350 km wide, how long ago (in years) were the continents in contact?  .......yr How does that time span compare to the age of Earth? (Enter your answer as a fraction of Earth's age.)

cal Science-SC5 X + ive r19.core.learn.edgenuity.com/player/ mental Science - SC5181 A < 21 90 The graph shows the changes in global temperatures over time. Estimated global temperature over the last 500 million years equatorial Pangea too hot for peat swamps Maa 500 450 23 24 25 Mark this and return 400 350 300 250 200 millions of years ago Cretaceous Hot Greenhouse world without polar ice caps Paleocene- Eocene Thermal Maximum world with polar ice caps (Courtesy of NASA) Which of the following hypotheses is supported by the data analysis? O Earth's temperature has natural cycles throughout history. Humans have caused all of Earth's temperature changes DELL 150 100 50 Today Adapted from Smithsonian Institution Save and Exit Next

What is remanent magnetism? How can it be used to track the movement of continents over time?

It is estimated that the global CO2 emission in 2014 was 35.9 Giga Tonnes(CO2.earth 2). If this emission rate continued, in what year will the amount of CO2 in the air double, based on our crude atmospheric model? Round to the nearest integer. (Hint: Build the equation by setting the time elapsed as x) O 5 year O 120 years O 12 O 12 million years

You want to use radiometric dating to determine the age of a specimen. You use Isotope Z, which has a half-life of 645 years. You measure your sample and find that 1/16 of the original amount of Isotope Z is present. How old is the sample?