What's the Dirt on ... Dirt?

What is the name scientists use for the top layer of Earth where plants grow?

• Dirt

• Mud

• Soil

• Sand

How do animals like worms and mice help the soil?

• They eat the plants

• They make the soil smell dirty

• They dig tunnels for air and water

• They turn the soil into rocks

What is the special part of soil that is full of nutrients and helps plants get their food?

• Clay

• Humus

• Rocks

• Sand

Which of these is NOT one of the four main things soil is made of?

• Minerals

• Water

• Air

• Plastic