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Comprehension & Parts of Speech- Dec. 01. 2020

Metal Detectors 



Have you ever been to the beach? Did you see a man with a headset pointing a long pole at the ground? If so you might have seen a person using a metal detector. 

People use these to find metal. Metal detectors make magnetic waves. These waves go through the ground. The waves change when they hit metal. Then the device beeps. This lets the person with the device know that metal is close. 

 The first metal detectors were meant to help miners. They were big. They cost a lot of money. They used a lot of power. And worst of all, they didn't work well. People kept trying to make them better. Metal detectors got smaller. Now they are light and cheap. 

They also work better. That is why people bring them to the beach. They can look for rings in the water. They can look for phones in the sand. Metal detectors help them find these things. They usually just find junk though. 









1. What does a metal detector look like?


2. When does a metal detector beep?


3. Explain one difference between the first metal detectors and the ones we have now. 


4. Name 2 things which metal detectors are able to find at the beach. 

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