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Q.1. Pluto is dwarf planet.
Q.2. The sun holds the planets with its gravitational force.
Q.3. When the moon blocks the sunlight it is called lunar eclipse.
False (When the Earth comes in between the sun and the Moon, the moon is not able to receive sunlight and the Earth casts a shadow on the Moon it is called lunar eclipse.
Q.4. The outer core of the earth is made up of magnesium.
False (The outer core is in liquid state).
Q.5. The moon has a thin layer of atmosphere called corona.
False (The sun has thin layer of atmosphere called sun).
Q.6. What is the solar system? How many plants are there in the solar system.
The sun and all the objects that revolve around it called solar system.
There are 8 planets in our solar system.
Q.7. Name the minerals found on the Earth’s crust.
The two most common silicate types found in the Earth’s crust are quartz and feldspar minerals.
Q.8. What is Solar Energy?
The sun consists of gases like hydrogen and helium. With great pressure hydrogen changes into helium and releases a lot of heat, light and energy which we call solar energy.
Q.9. Why do we see different appearance of the moon everyday?
This is because the moon reflects the light of the sun and the Moon orbits the earth, different parts of the moon get light from the sun and hence we see different shapes of the moon everyday.
Q.10. What are gas giants and ice giants?
The two outer planets beyond the orbit of Mars, Jupiter and Saturn are known as Gas giant as they are made of gases like hydrogen and helium and more distant planets, Uranus and Neptune are called ice giants.
Q.11. What is the Sun made of? How much time does the Earth take to orbit the Sun?
The sun is made up of gases like hydrogen and helium.
Earth takes 365 days 5 hours 48 minutes 46 seconds.
Q.12. How is the moon different from the earth?
There is no atmosphere on the moon. It has craters, mountains and plains with huge dust. The moon has very less gravity, one-sixth that of the earth. There is no water, so life is not possible on the Moon.
Q.13. What is an eclipse? Differentiate between solar eclipse and lunar eclipse.
An eclipse takes place when one heavenly body such as a moon or planet moves into the shadow of another heavenly body. There are two types of eclipses on Earth: an eclipse of the moon and an eclipse of the sun.