Explanation

Carbon dioxide, methane, and chlorofluorocarbons (CFS) are all significant air pollutants.

They contribute to global warming, ozone depletion, and air quality deterioration.

Explanation

Chlorine atoms in Chlorofluorocarbons (CFCs) are primarily responsible for the depletion of the ozone layer. 

Explanation

The ozone layer is located in the stratosphere, about 10 to 30 miles above Earth's surface.

It protects the Earth by absorbing most of the Sun's harmful ultraviolet (UV) radiation.

Explanation

Explanation

Hydrogen and helium are the two lightest gases, both significantly lighter than air. 

Hydrogen: Considered the lightest gas.

Helium: Also lighter than air, but twice as heavy as hydrogen.

Air: Has a higher molecular weight than both hydrogen and helium. 

Explanation

• An ecosystem includes all the living components (biotic factors) like plants, animals, and microorganisms, and non-living components (abiotic factors).
• Like soil, water, air, and sunlight, interacting with each other.

Explanation

The atmospheric pressure at any place is measured by a Barometer

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The barometer was invented by Evangelista in 1644.

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Explanation

• A lake starts freezing because of the cold atmosphere. It will first freeze At the top surface
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• concept:
• when the water freezes to ice, the ice becomes significantly less dense than the water and continues to float on the lake's surface.
• Below 4° Celsius, water becomes less dense as it gets colder, causing water to freeze to float to the top.
  
  

Explanation

The Earth's atmosphere is divided into five main layers: Troposphere, Stratosphere, Mesosphere, Thermosphere, and Exosphere.

Each layer has unique characteristics such as temperature, density, and composition.

Explanation

Greenhouses are mainly made of glass to allow sunlight to enter and trap heat inside for plant growth.

The glass panels create a warm, controlled environment ideal for cultivating plants year-round.