Let's solve the worksheet step by step and explain each part clearly.
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Q.1. Fill in the blanks with suitable words.
a) ________ is the mixture of gases that surrounds the Earth.
✔ Answer: *The atmosphere*
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Explanation: The atmosphere is the layer of gases that envelops the Earth, composed mainly of nitrogen (78%) and oxygen (21%), along with trace amounts of other gases like carbon dioxide, water vapor, and argon.
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b) The Earth, our planet, absorbs energy from ________ in the form of solar radiation.
✔ Answer: *the Sun*
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Explanation: The Earth receives energy primarily from the Sun in the form of sunlight or solar radiation. This energy drives weather, climate, and most life processes on Earth.
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c) About 30 percent of incoming solar energy is ________ back into space.
✔ Answer: *reflected*
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Explanation: Approximately 30% of the solar radiation that reaches Earth is reflected back into space by clouds, ice, snow, and other reflective surfaces. This is known as Earth’s albedo.
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d) ________ in the atmosphere, like the glass panes in a greenhouse, lets in sunlight and trap the heat energy escaping from the Earth. As a result, the temperature of Earth ________.
✔ Answer:
- First blank: *Greenhouse gases*
- Second blank: *increases* (or *rises*)
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Explanation: Greenhouse gases such as carbon dioxide (CO₂), methane (CH₄), and water vapor allow visible sunlight to pass through but absorb and re-radiate infrared (heat) radiation, trapping heat in the atmosphere. This natural process keeps Earth warm enough to support life. Without it, Earth would be much colder.
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Q.2. Write the major greenhouse gases in the spaces below.
From the diagram and scientific knowledge, the
major greenhouse gases are:
1.
Carbon dioxide (CO₂)
2.
Methane (CH₄)
3.
Nitrous oxide (N₂O)
4.
Water vapor (H₂O)
5.
Chlorofluorocarbons (CFCs) – though less common, they are potent greenhouse gases
But since only
four boxes are shown in the diagram, we'll fill the
most significant ones:
✔ Answers (in any order):
- Carbon dioxide (CO₂)
- Methane (CH₄)
- Nitrous oxide (N₂O)
- Water vapor (H₂O)
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Note: Water vapor is actually the most abundant greenhouse gas, but its concentration varies regionally. CO₂ is the primary human-emitted greenhouse gas contributing to global warming.
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✔ Final Answers Summary:
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Q.1:
a)
The atmosphere
b)
the Sun
c)
reflected
d)
Greenhouse gases,
increases
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Q.2:
Major greenhouse gases:
-
Carbon dioxide (CO₂)
-
Methane (CH₄)
-
Nitrous oxide (N₂O)
-
Water vapor (H₂O)
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Parent Tip: Review the logic above to help your child master the concept of greenhouse effect worksheet high school.
