Question

key vocabulary: emit absorb reflect
part 3: go to photons tab. select . then, select the ice age, 1750s, and 2020 tabs and record the greenhouse gases and temperature for each period. include units for full credit.
units key
ppm = parts per million ppb = parts per billion °c = degrees celsius

	time period		circle one: did these values increase or decrease over time?
greenhouse gas concentration ice age	1750s	2020
carbon dioxide concentration (co₂)			increase or decrease
methane concentration (ch₄)			increase or decrease
nitrous oxide concentration (n₂o)			increase or decrease
temperature			increase or decrease

Explanation:

To complete this task, you would typically use an interactive simulation or dataset related to the "Photons" tab (likely a climate or greenhouse gas simulation, such as the PhET simulation or similar educational tool). Here's how you would fill in the table with known scientific data:

Step 1: Recall/Collect Data

Use the simulation (or scientific knowledge) to find the values for each greenhouse gas and temperature across the time periods:

Greenhouse Gas Concentration / Temperature	Ice Age	1750’s	2020	Circle one: Increase or Decrease over time?
Methane (CH₄) Concentration	~350 ppb	722 ppb	1875 ppb (or similar)	Increase
Nitrous Oxide (N₂O) Concentration	~200 ppb	270 ppb	332 ppb (or similar)	Increase
Temperature	~5–7°C below pre - industrial	~14°C (pre - industrial baseline)	~15°C (or as per data)	Increase

of Trends

• Carbon Dioxide (CO₂): Over geological time (Ice Age to 1750s to 2020), human activities (fossil fuel burning, deforestation) have increased CO₂ levels from ~200 ppm (Ice Age) to 280 ppm (1750s, pre - industrial) to ~414 ppm (2020).
• Methane (CH₄): Natural sources (wetlands) and human sources (agriculture, fossil fuels) have increased CH₄ from ~350 ppb (Ice Age) to 722 ppb (1750s) to ~1875 ppb (2020).
• Nitrous Oxide (N₂O): Agricultural and industrial activities have raised N₂O from ~200 ppb (Ice Age) to 270 ppb (1750s) to ~332 ppb (2020).
• Temperature: The Ice Age was much colder (glacial period) than the pre - industrial 1750s and the warmer 2020, driven by greenhouse gas increases (and other factors like orbital cycles, but human - caused increases dominate post - 1750s).

If using a simulation (e.g., PhET’s “Greenhouse Effect” or similar), you would:

1. Navigate to the “Photons” tab (or equivalent).
2. Select the time - period tabs (Ice Age, 1750s, 2020).
3. Record the numerical values for each gas (with units: ppm for CO₂, ppb for CH₄/N₂O) and temperature (°C).

For example, with real - world data (simplified for education):

• Ice Age CO₂: ~200 ppm (glacial maximum, Antarctic ice core data).
• 1750s CO₂: 280 ppm (pre - industrial baseline).
• 2020 CO₂: ~414 ppm (Mauna Loa Observatory data).

• Ice Age CH₄: ~350 ppb (ice core data).
• 1750s CH₄: 722 ppb (pre - industrial).
• 2020 CH₄: ~1875 ppb (global average).

• Ice Age N₂O: ~200 ppb (ice core data).
• 1750s N₂O: 270 ppb (pre - industrial).
• 2020 N₂O: ~332 ppb.

• Temperature:
• Ice Age: ~ - 5°C to - 7°C (relative to pre - industrial).
• 1750s: ~14°C (pre - industrial global average).
• 2020: ~15°C (global average, showing warming).

The “Circle one” column for all gases and temperature would be “Increase” (from Ice Age to 1750s to 2020, with the most rapid increase post - 1750s due to human activity).

If you are using a specific simulation, follow its on - screen values for precision. The above is a general scientific summary of trends.

Answer:

of Trends

• Carbon Dioxide (CO₂): Over geological time (Ice Age to 1750s to 2020), human activities (fossil fuel burning, deforestation) have increased CO₂ levels from ~200 ppm (Ice Age) to 280 ppm (1750s, pre - industrial) to ~414 ppm (2020).
• Methane (CH₄): Natural sources (wetlands) and human sources (agriculture, fossil fuels) have increased CH₄ from ~350 ppb (Ice Age) to 722 ppb (1750s) to ~1875 ppb (2020).
• Nitrous Oxide (N₂O): Agricultural and industrial activities have raised N₂O from ~200 ppb (Ice Age) to 270 ppb (1750s) to ~332 ppb (2020).
• Temperature: The Ice Age was much colder (glacial period) than the pre - industrial 1750s and the warmer 2020, driven by greenhouse gas increases (and other factors like orbital cycles, but human - caused increases dominate post - 1750s).

If using a simulation (e.g., PhET’s “Greenhouse Effect” or similar), you would:

1. Navigate to the “Photons” tab (or equivalent).
2. Select the time - period tabs (Ice Age, 1750s, 2020).
3. Record the numerical values for each gas (with units: ppm for CO₂, ppb for CH₄/N₂O) and temperature (°C).

For example, with real - world data (simplified for education):

• Ice Age CO₂: ~200 ppm (glacial maximum, Antarctic ice core data).
• 1750s CO₂: 280 ppm (pre - industrial baseline).
• 2020 CO₂: ~414 ppm (Mauna Loa Observatory data).

• Ice Age CH₄: ~350 ppb (ice core data).
• 1750s CH₄: 722 ppb (pre - industrial).
• 2020 CH₄: ~1875 ppb (global average).

• Ice Age N₂O: ~200 ppb (ice core data).
• 1750s N₂O: 270 ppb (pre - industrial).
• 2020 N₂O: ~332 ppb.

• Temperature:
• Ice Age: ~ - 5°C to - 7°C (relative to pre - industrial).
• 1750s: ~14°C (pre - industrial global average).
• 2020: ~15°C (global average, showing warming).

The “Circle one” column for all gases and temperature would be “Increase” (from Ice Age to 1750s to 2020, with the most rapid increase post - 1750s due to human activity).

If you are using a specific simulation, follow its on - screen values for precision. The above is a general scientific summary of trends.