95 Magnetic Rocks-Mid

Magnetic Rocks FOCUS Question What kinds of natural materials stick to magnets?

磁性岩石焦点问题:什么样的天然材料能吸附在磁铁上?

Metal and Magnets Have you ever played with magnets? Maybe there are magnets on your refrigerator. Some toys also have magnets in them. A magnet is a special piece of metal. It pulls on, or attracts other pieces of metal. But where do magnets come from?

你玩过磁铁吗? 也许你的冰箱上有磁铁。 有些玩具里面也有磁铁。 磁铁是一种特殊的金属。 它拉着，或者吸引着其他金属。 但是磁铁是从哪里来的呢?

Magnets come from rocks. Some rocks are made mostly of metal. These metal rocks are attracted to magnets That means they stick to magnets. Other metal rocks are magnets. That means they attract certain kinds of metal.

磁铁来自岩石。有些岩石主要是由金属构成的。 这些金属岩石被磁铁吸引，这意味着它们会粘在磁铁上。 其他金属岩石是磁铁。 这意味着它们会吸引特定种类的金属。

Magnetite Magnetite is a special kind of rock. It sticks to magnets. Magnetite is made of a metal called iron. The iron is what sticks to magnets. Lots of rocks have some iron in them. But magnetite is almost all iron. Try This Some sand has small bits of magnetite in it. Run a magnet through sand. See if the magnet picks up any small, dark pieces. You found magnetite!

磁铁矿是一种特殊的岩石。 它粘在磁铁上。磁铁矿是由一种叫做铁的金属构成的。 铁是附着在磁铁上的东西。 许多岩石都含有铁。 但是磁铁矿几乎全是铁。 试试这个有些沙子里有小块磁铁矿。 在沙子里放一块磁铁。 看看磁铁能不能捕捉到黑色的小碎片。 你发现了磁铁矿!

Some people use big magnets to find magnetite in the ground. This helps them find iron. People use iron to make many things. Cars, buildings, and bridges are made with iron. Machines and tools are made of iron, too. Magnets also help pull iron out of other rocks that people don't want. Do You Know? Iron is in your blood You get it from many foods you eat. Your body uses iron to stay healthy.

有些人用大磁铁在地下寻找磁铁矿。 这有助于它们找到铁。 人们用铁制造许多东西。 汽车、建筑物和桥梁都是用铁建造的。 机器和工具也是铁做的。 磁铁也有助于从人们不想要的其他岩石中抽出铁。 你知道吗?铁元素存在于你的血液中。你从你吃的很多食物中获取铁元素。 你的身体需要铁来保持健康。

Making Magnets Every magnet has a magnetic field around it. You can't see it. but it's there, A magnet attracts certain metals if they come into its magnetic field. You can put metal in a strong magnetic field, like next to a big magnet. If it's the right kind of metal, it will become a magnet, too.

每块磁铁周围都有磁场。 你看不见它。但它就在那里，如果某些金属进入磁铁的磁场，磁铁就会吸引它们。 你可以把金属放在一个强磁场中，比如在一个大磁铁旁边。 如果是合适的金属，它也会变成磁铁。