Earth s atmosphere
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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

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
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
Question #1

  • Lots of volcanic eruptions

  • Violent storms

  • Meteorite impacts

  • Intense radiation from the sun

Question 2
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
Question #3

  • Cyanobacteria began using sunlight to make their own food.

  • This food making process released oxygen into the ocean and air.

Question 4
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
Analyzing Changes in the Earth’s Atmosphere


  • Glue the handout in your science notebook.

  • Use the graphs to answer the questions, providing detailed, complete answers.

Data analysis of pre life atmosphere
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
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.

Earth s atmosphere

Pre-Life Present Day

Comparison of atmosphere
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.


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.

Brain pop earth s atmosphere and the ozone layer
Brain Pop: Earth’s Atmosphere and the Ozone Layer