This educational worksheet helps students identify and understand the five main layers of Earth's atmosphere, from the troposphere at ground level to the exosphere extending thousands of kilometers into space.

Let's solve the worksheet step by step.

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Q.1: Label the diagram of the layers of the atmosphere

We are given the following keywords to use:
- Stratosphere
- Thermosphere
- Troposphere
- Mesosphere
- Ozone layer

And we have a diagram with altitude ranges:

1. 0 to 12 km → This is the Troposphere
- The lowest layer, where weather occurs and airplanes fly.
- Contains most of the Earth’s air mass.

2. 12 km to 50 km → This is the Stratosphere
- Contains the Ozone Layer, which absorbs UV radiation.
- Jet planes often fly in the lower part of this layer.

3. 50 km to 80 km → This is the Mesosphere
- The coldest layer; meteors burn up here (shown as fireballs in the image).

4. 80 km to 700 km → This is the Thermosphere
- Very high temperatures due to absorption of solar radiation.
- Satellites orbit in this region.

5. 700 km to 10,000 km → This is the Exosphere
- Outermost layer, gradually fading into space.
- Particles can escape into space.

6. Ozone layer → This is not a separate layer but a region within the Stratosphere (specifically around 20–50 km altitude). So it should be labeled inside the Stratosphere.

#### ✔ Correct Labels:
- 0 to 12 km: Troposphere
- 12 km to 50 km: Stratosphere (and include Ozone layer inside this section)
- 50 km to 80 km: Mesosphere
- 80 km to 700 km: Thermosphere
- 700 km to 10,000 km: Exosphere

> 💡 Note: The Ozone layer is not a full atmospheric layer but a region within the stratosphere where ozone concentration is highest. It should be labeled in the Stratosphere section.

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Q.2: True or False

Let’s evaluate each statement:

1. "Ozone is a gas made up of four oxygen atoms."
✘ False
- Ozone is O₃, meaning it consists of three oxygen atoms, not four.
- Four oxygen atoms would form O₄, which is not stable under normal conditions.
✔ Answer: F

2. "In addition to Earth, many of the other planets in the Solar System have atmospheres."
✔ True
- Venus, Mars, Jupiter, Saturn, Uranus, Neptune, and even some moons (like Titan) have atmospheres.
✔ Answer: T

3. "The main function of the ozone layer is to shield the Earth from the harmful ultraviolet rays of the sun."
✔ True
- The ozone layer absorbs most of the Sun’s harmful UV-B and UV-C radiation, protecting life on Earth.
✔ Answer: T

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✔ Final Answers:

#### Q.1: Labeled Diagram
From bottom to top:
- 0 to 12 km: Troposphere
- 12 km to 50 km: Stratosphere (with Ozone layer labeled inside)
- 50 km to 80 km: Mesosphere
- 80 km to 700 km: Thermosphere
- 700 km to 10,000 km: Exosphere

#### Q.2: True/False
1. F
2. T
3. T

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