A force is a push or a pull on an object. A force changes the motion of moving object. A force can be strong or weak and it always has it’s direction.
The Earth is a planet that goes around the sun in the circular orbit. The Earth has a layer of gas above it’s surface which helps to support life.
Atoms are the building blocks of matter. At the center of an atom it’s nucleus, which has a positive electric charge. Outside the nucleus are electrons, which have a negative charge.
Astroids and comics are object that orbit around sun but smaller than planed. Astroids that pass close to the Earth are called near-Earth objects.
The atmosphere is made of gases, such as oxygen and nitrogen. Without an atmosphere there would be no life on Earth.
英语流利说学习笔记📒Level4-Unit1-Part2-Science
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