The Greenhouse Effect: How greenhouse gases trap heat and maintain Earth's temperature.

Let's solve the problem step by step based on the image you provided.

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Part 1: Fill in the blanks on the diagram

We are given four keywords to use:
- Greenhouse
- Radiation
- Space
- Earth

Now, let’s analyze each blank in the diagram:

#### Blank 1:
"Heat Radiation Reflected from the ________"
→ This refers to heat radiation that is reflected *from* the Earth’s surface back into the atmosphere. So, it should be:
✔ Earth

#### Blank 2:
"Some Reflected Heat Radiation lost into ________"
→ Some of the heat radiated from Earth escapes into outer space. So, this should be:
✔ Space

#### Blank 3:
"Heat ________ Reflected Back to Earth"
→ The greenhouse gases trap heat and reflect it back toward Earth. The missing word here is a noun describing what is being reflected — “Radiation” fits perfectly.
✔ Radiation

#### Blank 4:
"Layer of ________ Gases"
→ This layer is made up of greenhouse gases that trap heat.
✔ Greenhouse

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✔ Final Answers for Part 1:

1. Earth
2. Space
3. Radiation
4. Greenhouse

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Part 2: Complete the graph using the table

We are given data for two variables:
- Year
- % CO₂ in Atmosphere
- Temperature rise (°C)

We need to:
- Label both axes
- Add a title
- Draw two lines: one for % CO₂ and one for temperature rise

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#### Step 1: Analyze the Data

| Year | % CO₂ | Temp. Rise (°C) |
|------|-------|------------------|
| 1700 | 0.028 | 0.00 |
| 1750 | 0.028 | 0.00 |
| 1800 | 0.028 | 0.00 |
| 1850 | 0.029 | 0.05 |
| 1900 | 0.030 | 0.15 |
| 1950 | 0.032 | 0.25 |
| 2000 | 0.036 | 0.60 |

Note: The right side of the graph has two scales:
- Left scale: % CO₂ (0.028 to 0.036)
- Right scale: Temperature rise (0.00 to 0.70°C)

So, we will plot two lines:
- One line connecting % CO₂ over time (left axis)
- One line connecting temperature rise over time (right axis)

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#### Step 2: Graph Setup

X-axis (horizontal): Years → label as "Year", range: 1700 to 2000
Left Y-axis (vertical): % CO₂ → label as "% CO₂ in Atmosphere", range: 0.028 to 0.036
Right Y-axis (vertical): Temperature rise → label as "Temperature Rise (°C)", range: 0.00 to 0.70

Title: "Increase in Atmospheric CO₂ and Global Temperature Rise (1700–2000)"

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#### Step 3: Plotting the Points

##### Line 1: % CO₂
- 1700 → 0.028
- 1750 → 0.028
- 1800 → 0.028
- 1850 → 0.029
- 1900 → 0.030
- 1950 → 0.032
- 2000 → 0.036

Connect these points with a smooth line.

##### Line 2: Temperature Rise
- 1700 → 0.00
- 1750 → 0.00
- 1800 → 0.00
- 1850 → 0.05
- 1900 → 0.15
- 1950 → 0.25
- 2000 → 0.60

Connect these points with another smooth line.

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#### Final Graph Instructions:

- Label X-axis: "Year"
- Label Left Y-axis: "% CO₂ in Atmosphere"
- Label Right Y-axis: "Temperature Rise (°C)"
- Title: "Atmospheric CO₂ and Global Warming (1700–2000)"
- Draw two lines:
- One for CO₂ (using left scale)
- One for temperature rise (using right scale)
- Use different colors or styles if possible (e.g., solid vs dashed), and include a legend.

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✔ Summary of Part 2:

- Axes:
- X: Year (1700–2000)
- Left Y: % CO₂ (0.028–0.036)
- Right Y: °C rise (0.00–0.70)
- Title: "Atmospheric CO₂ and Global Temperature Rise (1700–2000)"
- Two Lines:
- Line 1: % CO₂ increases slowly after 1850
- Line 2: Temperature rise starts increasing significantly after 1850

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🌍 Conclusion:

This worksheet illustrates how:
- The greenhouse effect keeps Earth warm.
- Greenhouse gases trap heat.
- Human activities have increased CO₂ levels since the Industrial Revolution.
- Rising CO₂ correlates with rising global temperatures.

By completing the diagram and graph, students can visualize the link between greenhouse gas emissions and climate change.

Let me know if you'd like a printable version or a visual sketch!