Rid the Riddles

Easy

100

I look like a tiny soldier, you can see me during Christmas time, and I can crush a shell. What am I?

I am a Nutcracker

200

I have mercury inside me. When I am cold it goes low, when its hot it goes high. I am a helpful tool. What am I?

I am a thermometer.

300

I am an organ that keeps your blood clean. If you did not have me you would not exist. What am I?

I am a liver.

Medium

100

I can live a long time. I carry my home everywhere I go. I can survive in the water and the land. What am I?

I am a turtle.

200

I am hard and gray and have a unique shape. You can find me outside and some people collect me. I can also be very helpful or functional for humans. What am I?

I am a rock

300

You can use me to see everywhere. I am something that is not alive and I am very thin. 

I am a map.

Hard

100

I am bought by the yard and worn by the foot. What am I?

I am a carpet.

200

I have no life but I can die. What am I?

I am a battery

300

You can see me but you can't actually see me. Some people say that I don't exist. I am most likely the wind. What am I?

I am a ghost