Atmosphere Layers Order
The Earth's atmosphere is structured into distinct layers, primarily based on temperature changes at different altitudes. Understanding the sequence of these layers, starting from the ground and moving upwards, is key to answering questions about their relative positions.
Atmosphere Layers Sequence
The primary layers of Earth's atmosphere are arranged as follows, from the surface upwards:
- Troposphere: This is the lowest layer, extending from the surface up to about 7-20 km (4-12 miles). It's where we live and where most weather events happen.
- Stratosphere: Situated above the troposphere, extending up to approximately 50 km (31 miles). This layer hosts the ozone layer, crucial for absorbing harmful ultraviolet radiation from the sun.
- Mesosphere: Located above the stratosphere, reaching heights of about 85 km (53 miles). This layer experiences extremely low temperatures, and it's where most meteors burn up upon entering the atmosphere.
- Thermosphere: This layer lies above the mesosphere and extends outwards to roughly 600 km (372 miles) or more. Temperatures increase with altitude in the thermosphere due to the absorption of high-energy solar radiation. Although temperatures are high, the air is extremely thin, meaning it wouldn't feel hot. This layer includes the ionosphere and is where phenomena like auroras occur, and satellites like the ISS orbit.
Note: The Exosphere is the outermost layer, gradually fading into space, but it was not among the options provided.
Outermost Atmosphere Layer Identification
The question asks to identify the outermost layer among the specific choices: Stratosphere, Mesosphere, Troposphere, and Thermosphere. Let's review their order:
| Layer Name | Position Relative to Earth's Surface |
|---|---|
| Troposphere | Innermost (1st Layer) |
| Stratosphere | 2nd Layer |
| Mesosphere | 3rd Layer |
| Thermosphere | 4th Layer (Outermost among the given options) |
Considering the options provided, the Thermosphere is the highest or outermost layer.
Important Questions from Atmosphere
Which of the following statements with reference to Surface inversion of temperature is/are correct? 1. It causes instability in the lower layers of the atmosphere. 2. This inversion commonly lasts for a few hours until the Sun comes up.
Identify the cloud on the basis of the following characteristics: I. They look like cotton wool. II. They exist in patches and have flat base. III. They are generally formed at a height of 4 to 7 km.
The ozone layer shields the surface of earth from _________ coming from the Sun.
- Arrange the following gases in decreasing order of their percentage abundance in atmosphere on dry basis.
A. Carbon dioxide
B. Argon
C. Helium
D. Neon
E. Methane
Choose the correct answer from the options given below: - Which of the following cloud types are found in stratosphere?
A. Cirrus clouds
B. Cumulonimbus clouds
C. Mother of Pearl clouds
D. Nacreous clouds
E. Noctilucent clouds
Choose the correct answer from the options given below:
