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Earth’s Atmosphere. Guiding Question #4. Warm-up 12/3/13. In your science notebook, list 3 facts you know about the Earth’s atmosphere. A Peak at the Earth’s Past Atmosphere. In the Red Science Textbook, READ pages 172-173
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Earth’s Atmosphere Guiding Question #4
Warm-up12/3/13 In your science notebook, list 3 facts you know about the Earth’s atmosphere.
A Peak at the Earth’s Past Atmosphere • In the Red Science Textbook, READ pages 172-173 • Glue the questions in your science notebook, and ANSWER them using the information you gathered from your reading.
Question #1 • Lots of volcanic eruptions • Violent storms • Meteorite impacts • Intense radiation from the sun
Question #2 Earth’s early atmosphere was made of- • Water vapor • Carbon dioxide • Nitrogen • Sulfur dioxide Early life on Earth consisted of simple-one celled organisms called PROKARYOTES, that did not need oxygen to survive
Question #3 • Cyanobacteria began using sunlight to make their own food. • This food making process released oxygen into the ocean and air.
Question #4 • Oxygen was present in the air and water • The ozone layer of the atmosphere formed blocking the amount of harmful radiation reaching the Earth’s surface. …as a result complex one-celled organisms formed, called EUKARYOTES, followed bymulticellular organisms
Analyzing Changes in the Earth’s Atmosphere Directions: • Glue the handout in your science notebook. • Use the graphs to answer the questions, providing detailed, complete answers.
Data Analysis of Pre-life atmosphere • Carbon Dioxide is the most abundant gas • There is more nitrogen than sulfur dioxide • 2% of the pre life atmosphere was other than CO2, N, SO2 • CO2 made up 90% of atmosphere • N made up 5% of atmosphere • SO2 made up 3% of atmosphere • There is 9 times as much CO2 as other gases combined.
Data Analysis of present atmosphere • Nitrogen makes up 78% of today’s atmosphere • Oxygen makes up 21% of today’s atmosphere • Carbon Dioxide and other gases make up 1% • Nitrogen is the most abundant gas in today’s atmosphere • Oxygen is the second most abundant gas • Only a small percentage of atmosphere is CO2 • There is more than 3x the amount of nitrogen compared to oxygen.
Comparison of atmosphere • There is 89% less CO2 today than in pre life. • There is 21% more oxygen today than in pre life. • The amount of nitrogen has increased by 73% in today’s atmosphere compared to pre-life • Nitrogen was one of the least abundant gases in pre- life, now it is the most abundant. • There is very little SO2 in present day atmosphere.
Reflection Now that you know how Earth’s Atmosphere has changed from Pre-Cambrian time to the our present day atmosphere, reflect on the following… Do you think our present day atmosphere will change in the future? Explain. Support with evidence.