六下英语第二单元课文的笔记

六下英语第二单元课文的笔记英文回答：
Lesson 2: Our planet, the Earth.
1. What is the planet we live on called?
We live on planet Earth.
2. What is the Earth's nickname?
The Earth is nicknamed the "blue planet".
3. Why is the Earth called the "blue planet"?
The Earth is called the "blue planet" because it has a lot of water, which appears blue from space.
4. What are the three main parts of the Earth?
The three main parts of the Earth are land, water, and air.
5. What is the largest part of the Earth?
Water is the largest part of the Earth.
6. What is the smallest part of the Earth?
Air is the smallest part of the Earth.
7. How old is the Earth?
The Earth is about 4.54 billion years old.
8. What is the Earth's atmosphere made of?
The Earth's atmosphere is made of 78% nitrogen, 21% oxygen, and 1% other gases.
9. What does the Earth's atmosphere do?
The Earth's atmosphere protects us from harmful rays from the sun, keeps us warm, and provides us with oxygen to breathe.
10. What are the Earth's oceans called?
The Earth's oceans are called the Pacific Ocean, the Atlantic Ocean, the Indian Ocean, the Arctic Ocean, and the Southern Ocean.
中文回答：
课文笔记，第二单元地球，我们的家园。

1. 人类所居住的星球名称，地球。

2. 地球的昵称，蓝色星球。

3. 地球被称作蓝色星球的原因，因为地球表面有大量的水域，从太空观察呈现蓝色。

4. 地球的主要组成部分，陆地、水体、空气。

5. 地球上最大的部分，水体。

6. 地球上最小的部分，空气。

7. 地球的年龄，约 45.4 亿年。

8. 地球大气层的组成，78% 氮气、21% 氧气、1% 其他气体。

9. 地球大气层的作用，保护地球免受太阳有害辐射的侵害，保温，提供氧气供生物呼吸。

10. 地球上五大洋的名称，太平洋、大西洋、印度洋、北冰洋、南冰洋。