1.) Gases in the atmosphere keep the temperature in a range to support life on earth. 2.) There is an exact place where the atmosphere ends.

If gas expands to fill all the space available to it, explain why the Earth's atmosphere doesn't drift off into space.

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The dust in the dust clouds in intersteller space consists of? a. atomic gas b. molecular gas c. tiny solid grains d. pieces of ice ranging from several meters to a kilometer in diameter

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

15. The consensus view among climate scientists is that the above increase in global temperature is due to an increase in atmospheric CO2 caused by human emissions. The below plot is a record of the increase in CO2 measured since 1960. A) What was the atmospheric CO2 concentration in 1960? B) How about in 2020? C) What do you think causes the annual variations? April 10, 2020 Carbon dioxide concentration at Mauna Loa Observatory 420 Full Record ending April 11, 2020 410 400 390 380 370 360 350 340 330 320 310 1960 1965 1970 1975 1980 1985 1990 1995 2000 2005 CO₂ Concentration (ppm) 2 OCEANOGRADE 2010 2015 2020

réptilés d. all) of these 7. The development of ozóne in the stratosphere and oxygen in the atmosphere first made possible the development of a. complex organisms b. single-cell organisms c. cyanobacteria d. all of these 8. Today, many scientists think that a. 'birds evolved from dinosaurs b. dinosaurs evolved from reptiles c. birds evolved from amphibians d. both a andb 9. Ediacaran organisms first appeared during the a. Precambrian Time b. Cambrian Period c. Permian Period d. none of these 10. As a. cyanobacteria b. trilobites evolved, they changed Earth's atmosphere by producing oxygen. c. reptiles d. dinosaurs Geologic Time