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I-A:Chondrites, witnesses of the early atmosphere

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I-A:Chondrites, witnesses of the early atmosphere

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Comment upon that document

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Use the diagram to explain to your classmate what the greenhouse effect is.

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Use the diagram to explain to your classmate what the greenhouse effect is.

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You can find some help by using the link "a little help" just below.

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II A : cyanobacteria, stromatolites and the oxygen revolution

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II A : cyanobacteria, stromatolites and the oxygen revolution

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a- the evolution of the different states of matter

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a- the evolution of the different states of matter

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Useful vocabulary for the description of the triple phase diagram just below

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 b- Describe that triple phase diagram for water

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 b- Describe that triple phase diagram for water

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4,4 billion years ago, atmospheric pressure was around 39 and 207 atm. Today, atmospheric pressure is 1 atm.

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Summarize the main ideas of this video to explain how the BIF's were formed

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Summarize the main ideas of this video to explain how the BIF's were formed

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Banded iron formations are sedimentary mineral deposits consisting of alternating beds of iron-rich minerals (mostly hematite) and silica-rich layers (chert or quartz) formed about 3.0 to 1.8 billion years ago

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More than 4 billion years ago, no scientist was able to take measurements on earth. From these examples, show that reconstructions of the first millions of years of Earth are science, not science fiction

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More than 4 billion years ago, no scientist was able to take measurements on earth. From these examples, show that reconstructions of the first millions of years of Earth are science, not science fiction

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I-B: Compare the composition of the early atmosphere and the actual atmosphere of the Earth

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I-B: Compare the composition of the early atmosphere and the actual atmosphere of the Earth

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Water, carbon dioxide and oxygen: find 3 problems to solve

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Associate the water phase diagram with the appearance of oceans on Earth

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Find information in the video to explain:
1- what happened to water and carbon dioxide after the Earth cooled down.
2-  What evidence ancient zircons bring to science.

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For the correction of activity  D-2 ( Zircons)

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For the correction of activity  D-2 ( Zircons)

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Carry out some research to complete the above diagram

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How does the greenhouse effect work?

As you might expect from the name, the greenhouse effect works ... like a greenhouse! A greenhouse is a building with glass walls and a glass roof. Greenhouses are used to grow plants, such as tomatoes and tropical flowers.

A greenhouse stays warm inside, even during the winter. In the daytime, sunlight shines into the greenhouse and warms the plants and air inside. At nighttime, it's colder outside, but the greenhouse stays pretty warm inside. That's because the glass walls of the greenhouse trap the Sun's heat.

The greenhouse effect works much the same way on Earth. Gases in the atmosphere, such as carbon dioxide, trap heat similar to the glass roof of a greenhouse. These heat-trapping gases are called greenhouse gases.

During the day, the Sun shines through the atmosphere. Earth's surface warms up in the sunlight. At night, Earth's surface cools, releasing heat back into the air. But some of the heat is trapped by the greenhouse gases in the atmosphere. That's what keeps our Earth a warm and cozy 58 degrees Fahrenheit (14 degrees Celsius), on average.

How are humans impacting the greenhouse effect?

Human activities are changing Earth's natural greenhouse effect. Burning fossil fuels like coal and oil puts more carbon dioxide into our atmosphere.

NASA has observed increases in the amount of carbon dioxide and some other greenhouse gases in our atmosphere. Too much of these greenhouse gases can cause Earth's atmosphere to trap more and more heat. This causes Earth to warm up.

What reduces the greenhouse effect on Earth?

Just like a glass greenhouse, Earth's greenhouse is also full of plants! Plants can help to balance the greenhouse effect on Earth. All plants - from giant trees to tiny phytoplankton in the ocean - take in carbon dioxide and give off oxygen.

The ocean also absorbs a lot of excess carbon dioxide in the air. Unfortunately, the increased carbon dioxide in the ocean changes the water, making it more acidic. This is called ocean acidification.

More acidic water can be harmful to many ocean creatures, such as certain shellfish and coral. Warming oceans - from too many greenhouse gases in the atmosphere - can also be harmful to these organisms. Warmer waters are a main cause of coral bleaching.

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Learn more about this process that occurs when gases in Earth's atmosphere trap the Sun's heat.