Geography Class 7 Chapter-1 Atmosphere (ICSE)

Which layer of the atmosphere is the lowest?

• Troposphere

• Stratosphere

• Mesosphere

• Exosphere

Answer explanation

The Troposphere is the lowest layer of Earth's atmosphere where weather occurs.

Which layer of the atmosphere is above the Troposphere?

• Stratosphere

• Mesosphere

• Thermosphere

• Exosphere

Answer explanation

The Stratosphere is situated above the Troposphere and contains the ozone layer.

What layer of the atmosphere lies above the Stratosphere and extends to about 80 km above the surface of the Earth?

• Mesosphere

• Thermosphere

• Exosphere

• Troposphere

Answer explanation

The Mesosphere is the layer above the Stratosphere and extends up to about 80 km.

Which layer plays a vital role in the greenhouse effect?

• Troposphere

• Stratosphere

• Mesosphere

• Thermosphere

Answer explanation

The Troposphere is the layer where the greenhouse effect occurs and helps to warm the Earth.

Which layer is the highest layer of Earth's atmosphere?

• Thermosphere

• Exosphere

• Mesosphere

• Stratosphere

Answer explanation

The Exosphere is the highest layer of Earth's atmosphere, gradually merging with outer space.

What is the name given to the envelope of air surrounding the Earth?

• Atmosphere

• Stratosphere

• Hydrosphere

• Lithosphere

Answer explanation

The envelope of air surrounding the Earth is called the atmosphere.

How far does the atmosphere extend from the surface of the Earth?

• 200 km

• 500 km

• 1,000 km

• 5,000 km

Answer explanation

The atmosphere extends to about 1,000 km from the surface of the Earth.

What is the most abundant gas in the Earth's atmosphere?

• Oxygen

• Carbon dioxide

• Nitrogen

• Argon

Answer explanation

Nitrogen is the most abundant gas in the Earth's atmosphere.

How much of the total mass of the atmosphere is found within 32 km?

• 50%

• 75%

• 90%

• 99%

Answer explanation

99% of the total mass of the atmosphere is found within 32 km.

Why do we need the atmosphere (air) to talk to each other?

• To breathe

• To generate sound waves

• To filter sunlight

• To maintain temperature

Answer explanation

We need the atmosphere (air) to talk to each other because sound waves need a medium to travel.