HOW LIFE HAS AFFECTED THE EARTH?

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The first bacteria on Earth _____ use oxygen.

did not

did

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What do you already know about EARLY EARTH'S ATMOSPHERE?

Predict how oxygen amounts have changed over time on Earth.
What would the line graph look like?

What is Table 1 data showing?

USING Table 1 data, on a separate graph paper, set up and graph "How OXYGEN Has Changed Over Time on Earth".

Hint: You can copy how to set it up.

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What is Table 2 data showing?

Now add the 10 GEOLOGIC EVENTS from Table 2 to the correct spots on your graph paper.

HOW LIFE HAS AFFECTED THE EARTH?

What do you already know about EARLY EARTH'S ATMOSPHERE?

HOW LIFE HAS AFFECTED THE EARTH?

The first bacteria on Earth _____ use oxygen.

What do you already know about EARLY EARTH'S ATMOSPHERE?

Predict how oxygen amounts have changed over time on Earth.
What would the line graph look like?

What is Table 1 data showing?

What is Table 2 data showing?

The first bacteria on Earth _____ use oxygen.

Photosynthesis (by cyanobacteria and plants) ______ oxygen gas.

2 ways scientists think Earth started to get more oxygen in the air is by:

Wait, how do we know how much oxygen was present before humans existed?
Because scientists have analyzed oxygen isotopes from gases trapped in __________.

Predict how oxygen amounts have changed over time on Earth.
What would the line graph look like?

What is Table 1 data showing?

Does your graph on your paper look like anything you predicted in #6?

What is Table 2 data showing?

Look at the data table 1 again.
Which gas has made up the LARGEST portion of the Earth's atmosphere for most of Earth's history?

Which gas did not appear until about 2 billion years ago?

Which gas has been almost nonexistent since about 3 billion years ago?

When limestone deposits became common, which gas appeared in the atmosphere?

Look at your graph paper.
Which event from the 10 you copied is correlated with (related to) the increase in oxygen (and the decrease in CO2)? WHY?

Look at your paper graph.
How would you describe the TREND of oxygen levels throughout Earth's history?

If cyanobacteria started doing photosynthesis 3bya, how come it took 1 billion years to start seeing oxygen in the air?

If Venus and Mars' atmospheres have mostly CO2 and Earth's atmosphere is mostly N and O...
WHY do you think our atmosphere is so different?

Photosynthesis (by cyanobacteria and plants) ______ oxygen gas.

2 ways scientists think Earth started to get more oxygen in the air is by:

Wait, how do we know how much oxygen was present before humans existed?
Because scientists have analyzed oxygen isotopes from gases trapped in __________.

Does your graph on your paper look like anything you predicted in #6?

Look at the data table 1 again.
Which gas has made up the LARGEST portion of the Earth's atmosphere for most of Earth's history?

Which gas did not appear until about 2 billion years ago?

Which gas has been almost nonexistent since about 3 billion years ago?

When limestone deposits became common, which gas appeared in the atmosphere?

Look at your graph paper.
Which event from the 10 you copied is correlated with (related to) the increase in oxygen (and the decrease in CO2)? WHY?

Look at your paper graph.
How would you describe the TREND of oxygen levels throughout Earth's history?

If cyanobacteria started doing photosynthesis 3bya, how come it took 1 billion years to start seeing oxygen in the air?

If Venus and Mars' atmospheres have mostly CO2 and Earth's atmosphere is mostly N and O...
WHY do you think our atmosphere is so different?

HOW LIFE HAS AFFECTED THE EARTH?

What do you already know about EARLY EARTH'S ATMOSPHERE?

HOW LIFE HAS AFFECTED THE EARTH?

The first bacteria on Earth _____ use oxygen.

What do you already know about EARLY EARTH'S ATMOSPHERE?

Predict how oxygen amounts have changed over time on Earth.What would the line graph look like?

What is Table 1 data showing?

What is Table 2 data showing?

The first bacteria on Earth _____ use oxygen.

Photosynthesis (by cyanobacteria and plants) ______ oxygen gas.

2 ways scientists think Earth started to get more oxygen in the air is by:

Wait, how do we know how much oxygen was present before humans existed? Because scientists have analyzed oxygen isotopes from gases trapped in __________.

Predict how oxygen amounts have changed over time on Earth.What would the line graph look like?

What is Table 1 data showing?

Does your graph on your paper look like anything you predicted in #6?

What is Table 2 data showing?

Look at the data table 1 again. Which gas has made up the LARGEST portion of the Earth's atmosphere for most of Earth's history?

Which gas did not appear until about 2 billion years ago?

Which gas has been almost nonexistent since about 3 billion years ago?

When limestone deposits became common, which gas appeared in the atmosphere?

Look at your graph paper. Which event from the 10 you copied is correlated with (related to) the increase in oxygen (and the decrease in CO2)? WHY?

Look at your paper graph.How would you describe the TREND of oxygen levels throughout Earth's history?

If cyanobacteria started doing photosynthesis 3bya, how come it took 1 billion years to start seeing oxygen in the air?

If Venus and Mars' atmospheres have mostly CO2 and Earth's atmosphere is mostly N and O...WHY do you think our atmosphere is so different?

Photosynthesis (by cyanobacteria and plants) ______ oxygen gas.

2 ways scientists think Earth started to get more oxygen in the air is by:

Wait, how do we know how much oxygen was present before humans existed? Because scientists have analyzed oxygen isotopes from gases trapped in __________.

Does your graph on your paper look like anything you predicted in #6?

Look at the data table 1 again. Which gas has made up the LARGEST portion of the Earth's atmosphere for most of Earth's history?

Which gas did not appear until about 2 billion years ago?

Which gas has been almost nonexistent since about 3 billion years ago?

When limestone deposits became common, which gas appeared in the atmosphere?

Look at your graph paper. Which event from the 10 you copied is correlated with (related to) the increase in oxygen (and the decrease in CO2)? WHY?

Look at your paper graph.How would you describe the TREND of oxygen levels throughout Earth's history?

If cyanobacteria started doing photosynthesis 3bya, how come it took 1 billion years to start seeing oxygen in the air?

If Venus and Mars' atmospheres have mostly CO2 and Earth's atmosphere is mostly N and O...WHY do you think our atmosphere is so different?

Predict how oxygen amounts have changed over time on Earth.
What would the line graph look like?

Wait, how do we know how much oxygen was present before humans existed?
Because scientists have analyzed oxygen isotopes from gases trapped in __________.

Predict how oxygen amounts have changed over time on Earth.
What would the line graph look like?

Look at the data table 1 again.
Which gas has made up the LARGEST portion of the Earth's atmosphere for most of Earth's history?

Look at your graph paper.
Which event from the 10 you copied is correlated with (related to) the increase in oxygen (and the decrease in CO2)? WHY?

Look at your paper graph.
How would you describe the TREND of oxygen levels throughout Earth's history?

If Venus and Mars' atmospheres have mostly CO2 and Earth's atmosphere is mostly N and O...
WHY do you think our atmosphere is so different?

Wait, how do we know how much oxygen was present before humans existed?
Because scientists have analyzed oxygen isotopes from gases trapped in __________.

Look at the data table 1 again.
Which gas has made up the LARGEST portion of the Earth's atmosphere for most of Earth's history?

Look at your graph paper.
Which event from the 10 you copied is correlated with (related to) the increase in oxygen (and the decrease in CO2)? WHY?

Look at your paper graph.
How would you describe the TREND of oxygen levels throughout Earth's history?

If Venus and Mars' atmospheres have mostly CO2 and Earth's atmosphere is mostly N and O...
WHY do you think our atmosphere is so different?