Cuestionario: Earth's Atmosphere: Layers and Composition — 9 preguntas

1. What is the stratosphere?

A. The layer where meteors burn upon entry, extending from about 50 km to 85 km.

B. The outermost layer where atmospheric particles are sparse and can escape into space.

C. The layer above the troposphere, containing the ozone layer and characterized by increasing temperatures with altitude.

D. The lowest layer of Earth's atmosphere, where weather occurs.

Answer: (C)

Explicación

The stratosphere is the layer above the troposphere, from roughly 15 km to 50 km altitude, and contains the ozone layer. It is characterized by increasing temperatures with altitude, unlike the troposphere where temperature decreases with altitude.

2. What is the approximate altitude range of the Earth's troposphere?

A. 0 to 8 km

B. 8 to 15 km

C. 0 to 15 km

D. 15 to 50 km

Answer: (C)

Explicación

The troposphere extends from Earth's surface up to about 8-15 km, and this is where most weather phenomena occur. The other options either underestimate or overestimate its range.

3. What is the approximate percentage of nitrogen in Earth's atmosphere?

A. Approximately 88%

B. Approximately 78%

C. Approximately 68%

D. Approximately 58%

Answer: (B)

Explicación

The Earth's atmosphere is composed mainly of nitrogen, which makes up about 78% of the atmosphere's volume. This is a well-established fact and is explicitly stated in the content, making option 0 the correct answer.

4. Which layer of the atmosphere contains the ozone layer?

A. Troposphere

B. Stratosphere

C. Mesosphere

D. Thermosphere

Answer: (B)

Explicación

The ozone layer is located within the stratosphere, where it absorbs ultraviolet radiation. It is not in the troposphere, mesosphere, or thermosphere.

5. What is the primary role of the solar radiation balance in Earth's climate system?

A. To decrease Earth's temperature by reflecting all incoming solar radiation

B. To prevent solar radiation from reaching Earth's surface altogether

C. To increase the amount of solar energy reaching Earth's surface for photosynthesis

D. To regulate the amount of solar energy absorbed and emitted by Earth, maintaining climate stability

Answer: (D)

Explicación

The primary role of the solar radiation balance is to regulate the amount of solar energy absorbed by Earth and the energy it emits back into space, thereby maintaining climate stability. This balance ensures that Earth's temperature remains within a range conducive to life. The other options are incorrect because they either oversimplify or misrepresent the function of the solar radiation balance, which is about equilibrium rather than increasing or preventing solar energy.

6. What percentage of the Earth's atmosphere is made up of nitrogen?

A. 78%

B. 21%

C. 1%

D. 50%

Answer: (A)

Explicación

Nitrogen makes up about 78% of the Earth's atmosphere, making it the most abundant atmospheric gas, with oxygen at about 21%.

7. Which atmospheric layer is characterized by a significant increase in temperature due to absorption of high-energy solar radiation?

A. Troposphere

B. Stratosphere

C. Thermosphere

D. Mesosphere

Answer: (C)

Explicación

The thermosphere experiences a significant temperature increase because it absorbs high-energy solar radiation, unlike the troposphere, stratosphere, and mesosphere.

8. What happens in the mesosphere, roughly between 50 km to 85 km altitude?

A. Temperature increases with altitude

B. Meteors burn when entering this layer

C. Contains the ozone layer

D. Auroras are most visible here

Answer: (B)

Explicación

In the mesosphere, temperatures decrease with altitude, and meteors burn upon entry, making it a critical zone for meteoric phenomena.

9. Approximately how high does the exosphere extend before merging with outer space?

A. 85 km

B. 600 km

C. 50 km

D. 15 km

Answer: (B)

Explicación

The exosphere begins around 600 km and gradually transitions into outer space, containing sparse particles that can escape into space.