Class 3 Exam > Class 3 Notes > Science for Class 3 > Worksheet: The Earth
The Earth - CBSE Worksheets
Q1: Multiple Choice Questions (MCQs)
(i) The revolution of the earth causes :
(a) changes in seasons
(b) day and night
(c) planets to grow
(d) none of these
(ii) The earth completes one revolution around the sun in about :
(a) 365 1/4 days
(b) 370 days
(c) 385 days
(d) 350 1/4 days
(iii) The rotation of the earth causes :
(a) changes in seasons
(b) day and night
(c) planets to grow
(d) none of these
(iv) Time taken by the earth to complete one rotation is :
(a) 12 hours
(b) 36 hours
(c) 24 hours
(d) 48 hours
(v) The actual shape of the earth is :
(a) square
(b) spherical
(c) conical
(d) triangular
Q2: Fill in the blanks with the given words:
seasons, rotation, spherical, earth, sun
(a) The earth is ________ in shape.
(b) Day and night are caused by the ________ of the earth on its axis.
(c) ________ is the only known planet which supports life.
(d) The revolution of the earth causes the changes in ________.
(e) The earth takes about 3651/4 days to revolve around the ________.
Answer the following questions.
Q3: What is the revolution of the earth?
Q4: How are day and night formed on earth?
Q5: In how many days does the earth complete one revolution around the sun?
Q6: Give two evidences to show that the earth is spherical in shape.
Q7: Explain the movement of the earth.
Q8: Why cannot we see the sun at night?
Q9: State True or False for the given statements.
(a) The rotation of the earth results in day and night. ()
(b) The earth takes twelve hours to complete one rotation. ()
(c) The path taken by the earth around the sun is called its orbit. ()
(d) The spinning of the earth on its own axis is called revolution of the earth. ()
You can access the solutions to this worksheet here.
The document The Earth - CBSE Worksheets is a part of the Class 3 Course Science for Class 3.
All you need of Class 3 at this link: Class 3
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FAQs on The Earth - CBSE Worksheets
| 1. What is the composition of the Earth’s layers? |  |
Ans. The Earth is composed of several layers: the inner core, outer core, mantle, and crust. The inner core is primarily made of iron and nickel, while the outer core is liquid and also consists of iron and nickel. The mantle is made of silicate rocks and extends to about 2,900 kilometers beneath the surface. The crust is the thin outer layer where we live, consisting of continental and oceanic crust.
| 2. How does the Earth's atmosphere protect life? | |
Ans. The Earth's atmosphere protects life by filtering harmful solar radiation, regulating temperature, and providing essential gases. The ozone layer within the atmosphere absorbs most of the Sun's harmful ultraviolet radiation. Additionally, the atmosphere helps maintain a stable climate by trapping heat through the greenhouse effect.
| 3. What causes earthquakes and how are they measured? | |
Ans. Earthquakes are caused by the sudden release of energy in the Earth's crust due to tectonic plate movements. This release creates seismic waves. Earthquakes are measured using seismometers, which record the intensity and duration of the shaking. The magnitude is often reported on the Richter scale or the moment magnitude scale.
| 4. What is the significance of the water cycle on Earth? | |
Ans. The water cycle is crucial for maintaining life on Earth as it regulates weather patterns, replenishes groundwater, and supports ecosystems. It involves processes like evaporation, condensation, precipitation, and runoff, ensuring that water is continuously circulated through the environment, making it available for plants, animals, and human use.
| 5. How do human activities impact the Earth’s environment? | |
Ans. Human activities, such as deforestation, pollution, and fossil fuel consumption, significantly impact the Earth's environment. These actions lead to habitat destruction, climate change, and increased greenhouse gas emissions, which contribute to global warming. Sustainable practices and conservation efforts are essential to mitigate these effects and protect the planet for future generations.
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Dec 22, 2024 Last updated |
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