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Answer:
There are four layers of the Earth, including Inner Core, Outer Core, mantle, and Crust. Each layer has its characteristics because of its temperature and formation.
The inner core is solid with iron and other metal deposit in it. The outer core is liquid, while the mantle is composed of silicate rocks. The crust is the outer layer of the earth, consist of different types of rocks.
The earth was able to develop a layer structure because of the climatic change it had millions of years ago, where the hardest metal reached to its core.
It depends on how the test is set up to depends on how revising it will work
The correct answer is A. China is the East Asian country that is the major competitor of US traders. They run almost everything of the world trade for cheap and large quantities of goods. Everywhere you go in the world, you will see "Made in China" products.
B is the answer to this question