Let's solve each part of the worksheet step by step and explain the answers.
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1. Fill in the blanks
a. A _______ is a large heavenly body that revolves around a star.
✔ Answer: *Planet*
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Explanation: A planet is a celestial body that orbits a star (like the Sun), is spherical in shape, and has cleared its orbit of other debris. For example, Earth, Mars, Jupiter are planets.
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b. ______ is the natural satellite of the Earth.
✔ Answer: *Moon*
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Explanation: The Moon is Earth’s only natural satellite. It orbits around Earth and is not a planet but a moon (or natural satellite).
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c. The innermost layer of the Earth is called the ________
✔ Answer: *Core*
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Explanation: The Earth has three main layers: crust, mantle, and core. The
core is the innermost layer and is divided into the outer core (liquid) and inner core (solid). It is made mostly of iron and nickel.
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2. Select the correct answer
A. Which of the following is the cause of seasons on the Earth?
✔ Answer: *d. Both (a) and (c)*
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Explanation: Seasons are caused by two factors:
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Revolution of the Earth around the Sun (takes about 365 days).
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Earth’s tilted axis (about 23.5 degrees), which causes different parts of Earth to receive varying amounts of sunlight throughout the year.
So, both revolution and axial tilt together cause the seasons.
> Note: Rotation causes day and night, not seasons.
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B. Which planet is called the morning star?
✔ Answer: *c. Venus*
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Explanation: Venus is often called the "morning star" because it appears brightly in the eastern sky just before sunrise. It can also appear in the evening sky after sunset, then it's called the "evening star." But it's most commonly known as the morning star.
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C. The following has maximum numbers of moons.
✔ Answer: *d. Jupiter*
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Explanation: As of recent data,
Jupiter has the most moons in the solar system — over
90 confirmed moons, more than any other planet. Saturn comes second with about 80+ moons.
> Note: This may vary slightly as new moons are discovered, but currently, Jupiter leads.
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3. Identify
We have three images next to the questions:
a. The blue planet of our solar system.
✔ Answer: *Earth*
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Explanation: Earth is often called the "blue planet" because it appears blue from space due to the vast amount of water covering its surface.
b. The red planet of our solar system
✔ Answer: *Mars*
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Explanation: Mars is known as the "Red Planet" because its surface contains iron oxide (rust), giving it a reddish appearance.
c. The hottest planet of our solar system
✔ Answer: *Venus*
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Explanation: Although Mercury is closer to the Sun,
Venus is the hottest planet due to its thick atmosphere rich in carbon dioxide, which creates a strong greenhouse effect. Surface temperatures on Venus can reach up to
470°C (880°F).
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✔ Final Answers Summary:
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1. Fill in the blanks
a.
Planet
b.
Moon
c.
Core
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2. Select the correct answer
A.
d. Both (a) and (c)
B.
c. Venus
C.
d. Jupiter
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3. Identify
a.
Earth
b.
Mars
c.
Venus
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This worksheet teaches basic astronomy concepts suitable for Grade IV students, focusing on planetary facts, Earth's structure, and motions causing seasons. Great job! 🌍✨
Parent Tip: Review the logic above to help your child master the concept of 4th grade solar system worksheet.
