What is a garden stone?

• A small piece of soil
• A drop of sea water
• A small piece of rock

What do we call the solid rock below soil?

• Loose soil
• Solid bedrock
• Small loose stones

A garden stone keeps its shape when you set it down.

Circle one:   True   False

Which mixture can be found in soil?

• Rock bits alone, with no old plant parts
• Rock bits mixed with old plant parts
• Old plant parts alone, with no rock bits

Sana sees soil on top of the ground. Can she tell how far below it the bedrock is just by looking at the top?

• No. Bedrock can lie at different depths.
• Yes. Soil always means bedrock is far below it.
• Yes. Soil always means bedrock is just below it.

Which description matches the sea and the ground below it?

• Sea water reaches all the way to Earth's centre.
• Sea water has no ground anywhere beneath it.
• Solid rock lies below the sea water.

A friend says every part of Earth must be rock because a stone is rock. What can you say?

• One stone proves Earth is rock all the way through.
• Earth has other materials as well as rock.
• A stone proves Earth has no water or other materials.

Ben finds a plastic button in a garden. He says it must be natural rock because it was on the ground. Which fact checks his idea?

• A plastic button is made by people.
• A plastic button is a kind of natural stone.
• A plastic button becomes rock in the soil.