What is the top layer of soil called?
What nonliving things can you find in the soil?
What do most plants need to grow?
Which part of the soil has bits of dead plants and animals?
Which kind of soil holds the most water?
Which layer of soil has the most humus?
What would harm soil the most?
What happens when living things decompose?
What kind of soil do you think is in the desert?
Which kind of soil has the most humus?