Earth and The Celestial Bodies
- Stars, planets, constellations and satellites are heavenly bodies collectively known as celestial bodies.
- The Earth is the only planet where life exists, and it revolves around the Sun,
- We see different seasons like summer, monsoon, autumn, winter, and spring because the Earth moves around the Sun.
- The Earth has many landforms like mountains, plateaus, deserts, plains and valleys.
- Except for the Sun, there are eight planets in the solar system.
- The celestial bodies that revolve around the planets are called satellites.
All About Earth
Question 1:
What is the percentage of land and water on Earth?
Answer:
- About 71% of the Earth is covered with water, and the rest, 29%, is covered with land.
- If we divide the planet Earth into four equal parts, then three parts are made up of water, and one is made up of land.
- This is the reason why Earth is called the blue planet.
Question 2:
What Is an Orbit?
Answer:
- An orbit is an elliptical track on which a planet or a satellite moves around a star.
- Example: Movement of the Earth around the Sun and the Moon around the Earth.
Question 3:
What Is the Difference Between Rotation and Revolution?
Answer:
The differences between rotation and revolution are as follows:
| Rotation | Revolution |
|---|---|
| 1. The movement of the Earth around its axis is called rotation. | 1. The movement of the Earth around the Sun is called revolution. |
| 2. The occurrence of day and night on Earth is due to the rotation of the Earth. | 2. The occurrence of different seasons throughout the year is due to the revolution of the Earth. |
Question 4:
What Is the Meaning of the Atmosphere?
Answer:
- Layers of gases surround the Earth called the atmosphere.
- The atmosphere comprises gases like nitrogen, oxygen, carbon dioxide, argon and helium.
- Different layers of the atmosphere have different names.
Question 5:
How Many Natural Satellites Move Around the Earth?
Answer:
- Only one natural satellite or Moon moves around the Earth.
- Apart from the Moon, many other artificial satellites move around the Earth.
Question 6:
What Is the Highest and Lowest Point on the Earth?
Answer:
- The highest point on the Earth is Mt. Everest in Nepal.
- The height of this peak is 8848 metres from sea level.
- The Dead Sea, located in the Middle East, is the lowest point on Earth (not underwater).
Raw Food and Cooked Food
Question 1:
Why Is Pluto No More Considered a Planet?
Answer:
Initially, Pluto was considered a dwarf planet,
but now it is no more considered a planet for the following
reasons:
- Pluto has several celestial bodies in orbit, which is not a proper characteristic of a planet.
- Pluto has many satellites, and some of those are almost like Pluto.
- In 2005, scientists discovered a planetary body named Eris, bigger than Pluto.
Question 2:
Which Planets Have Water?
Answer:
- The Earth, mercury, mars, Jupiter, Saturn, Uranus and Neptune, have water on them.
Question 3:
What Is a Galaxy?
Answer:
- A large group of celestial bodies are called galaxies.
- The whole solar system and the Milky Way are a part of a galaxy.
- Some galaxies are visible through the naked eye in the night sky.
